📖 Part 9: Organizing at Scale — Decks, Subdecks, Tags & Filtered Decks

Once you have more than a few hundred cards, finding and steering them matters as much as writing them. This part shows you how experienced users organize large collections: a small number of decks, a rich set of tags, and the Browse window's search syntax as your power tool — plus filtered decks for when you need to cram or drill something specific.

📚 What You'll Learn

By the end of this part, you'll understand:

How decks and subdecks work — and why a card lives in exactly one deck
The guiding principle of few decks, many tags and why over-splitting hurts
How tags label your notes freely without touching the scheduler
The Browse window and a reference table of the search operators that make it powerful
What flags, marking, suspend, and bury each do, and when to use them
How filtered decks and Custom Study let you cram or drill without breaking the scheduler

In This Part

Decks & Subdecks

A deck is a study container. When you click a deck and press Study Now, Anki serves up that deck's due cards for the day. The most important rule to internalize is simple: a card lives in exactly one deck at a time. Decks are about where you study from — they answer the question "what am I sitting down to review right now?"

📖 Definition

Deck: a named group of cards you study together. Each card belongs to one deck only. Decks primarily decide grouping and study order, not what a card is about.

Subdecks let you nest decks inside one another. You create a subdeck just by putting :: (two colons) in the deck name. So a deck named Spanish::Verbs becomes a child deck Verbs living inside a parent deck Spanish. You can nest as deep as you like: Spanish::Verbs::Irregular.

The useful part is how studying interacts with the hierarchy. If you study the parent deck, Anki includes the cards from all of its children. If you study a child deck on its own, you get only that child's cards. So one Spanish deck with a few subdecks lets you either review everything at once (study the parent) or focus narrowly (study a child) — without duplicating any cards.

graph TD A["Spanish (parent)"] --> B["Spanish::Verbs"] A --> C["Spanish::Vocabulary"] B --> D["Spanish::Verbs::Irregular"] A -.->|"study parent = all children too"| E["Everything due in Spanish"] D -.->|"study child alone"| F["Only irregular verbs due"]

✅ Tip

Deck options (limits, FSRS settings, and so on) can be attached per deck, but subdecks inherit their scheduling from the options group you assign. Keeping related material under one parent makes it easy to apply consistent settings to a whole subject at once.

Few Decks, Many Tags

Here is the single most important organizing principle in Anki, and the one beginners most often get wrong: use few decks and many tags.

The instinct when starting out is to make a deck for every topic — a deck for chapter 1, a deck for chapter 2, a deck for verbs, a deck for food words, and so on. It feels tidy. But because a card lives in only one deck, and because you study decks one at a time, splitting into dozens of decks fragments your reviews. Your due cards get scattered, you have to hop between decks, the cards from different topics never interleave, and it becomes tempting to skip whole decks. Worse, fine-grained decks fight against the way spaced repetition wants to shuffle everything together.

⚠️ Important: Decks decide when and how you sit down to study. Tags decide what a card is about. Don't use decks to record topics — that's the tags' job. Reach for a new deck only when you genuinely want to study that material as a separate session.

A healthy structure is usually a small number of decks organized by how you actually study — often one per subject or course (Spanish, Biology, Work) — and then tags for every topic, chapter, or attribute you might later want to filter by.

What tags are

📖 Definition

Tag: a label attached to a note (and therefore to all the cards that note generates). A note can carry many tags at once — for example chapter-3, verbs, and high-yield all on the same note. Tags are for finding and filtering; they do not affect scheduling in any way.

Because a note can hold as many tags as you like, tags escape the one-deck limit entirely. A single card can be "chapter 3" and "verbs" and "high-yield" at the same time — something decks could never express. Tags also support hierarchy with ::, just like deck names: grammar::tense::past creates a collapsible tag tree in the sidebar. This gives you the neat, browsable organization people think they want from many decks, without any of the review-fragmentation cost.

✅ Tip

You can select many notes in the Browse window and add or remove a tag on all of them at once (Notes menu, or right-click). Retagging is cheap and reversible, so don't agonize over the perfect scheme up front — start simple and refine as patterns emerge.

Browse & Search Syntax

The Browse window (the "Browse" button on the main screen, or press b) is your database view — every note and card in your collection, searchable and editable in one place. The left sidebar lists your decks, tags, note types, and saved searches; the top holds a search bar; the results appear as a table you can sort and select.

The search bar is where Anki's real organizing power lives. Instead of clicking around, you type a query and Anki shows exactly the cards that match. Once you learn a handful of operators, you can pinpoint any slice of your collection — "all suspended verb cards in Spanish added this week" — in seconds.

Search operator reference

Query	Matches
`deck:Spanish`	Cards in the Spanish deck (and its subdecks)
`deck:Spanish::*`	Cards in Spanish's subdecks (the `*` wildcard matches any sub-path)
`tag:verbs`	Notes carrying the `verbs` tag
`tag:none`	Notes with no tags at all (great for cleanup)
`is:due`	Cards due for review right now
`is:new`	Cards you haven't studied yet
`is:review`	Cards in the review stage (graduated, being scheduled)
`is:suspended`	Cards you've suspended (excluded from study)
`added:7`	Cards added in the last 7 days
`rated:1`	Cards you rated (answered) today
`prop:ivl>=21`	Cards whose interval is 21 days or more (mature cards)
`prop:due=0`	Cards due today (0 days from now)
`flag:1`	Cards you've marked with flag 1 (red)
`"front:exact phrase"`	Notes whose Front field exactly equals that phrase
`photosynthesis`	Plain text search — notes containing that word anywhere
`a b` (a space)	AND — both terms must match
`a OR b`	OR — either term matches
`-tag:verbs`	NOT — the leading `-` excludes matches

Worked examples

Operators combine. Separating terms with a space means AND, so you build precise queries by stacking conditions:

deck:Spanish tag:verbs is:due
    → verb cards in Spanish that are due today

deck:Spanish::* -tag:high-yield is:new
    → new cards in Spanish subdecks that are NOT tagged high-yield

tag:chapter-3 (is:due OR is:new) prop:ivl<7
    → chapter-3 cards that are due or new and still have short intervals

added:7 tag:none
    → anything added this week that you forgot to tag

✅ Tip

When you land on a query you'll want again, click the star / save option to store it as a saved search in the sidebar. "Leeches", "Untagged", and "Mature cards" make handy one-click filters you'll return to constantly.

Flags, Marking, Suspend & Bury

Beyond decks and tags, Anki gives you a few per-card controls for triage and pausing. They're easy to mix up, so here's exactly what each one does.

Flags & marking

Flags are colored markers (red, orange, green, blue, and more) you can slap on a card during review or in Browse — press 1–4 while reviewing, or use the Flag menu. They're purely for your own triage: "flag red = fix this card later", "flag green = revisit for a test". You find them again with flag:1, flag:2, and so on. Marking is similar but applies a marked tag to the note (toggle with *), searchable as tag:marked.

Suspend vs. bury

Action	What it does	When to use it
Suspend	Removes the card from review indefinitely — it won't appear until you manually unsuspend it. The card turns yellow in Browse.	A card you're not ready for, a duplicate, or something broken you want to fix before it comes back. Long-term pause.
Bury	Hides the card only until tomorrow; it returns automatically at the next day's rollover.	Skip a card for today — you're stuck on it, or you want to avoid seeing its sibling card in the same session. Short-term, self-clearing.

⚠️ Important: Suspend is the "stop showing me this" button; bury is the "not right now, try again tomorrow" button. Suspended cards stay parked until you deliberately bring them back, so check is:suspended occasionally to make sure nothing is stuck there that you meant to study.

Filtered Decks & Custom Study

Sometimes the normal schedule isn't what you need. Maybe an exam is in three days and you want to cram a specific chapter, or you keep lapsing on a set of cards and want to drill just those. That's what filtered decks are for.

📖 Definition

Filtered deck: a temporary deck built from a search query. It pulls matching cards out of their home decks, lets you study them however you specify, and then returns them to where they came from — restoring their normal schedule — when you empty or delete the filtered deck.

Because the cards are only borrowed, a filtered deck is a safe, self-contained way to study a slice on your own terms — for example "everything tagged exam-unit-4, in random order, ignoring the scheduler for a few days". When you're done, you delete the filtered deck and every card slots back into its regular rotation.

Custom Study

Custom Study is a friendly front-end that builds common filtered decks for you without writing a query. From a deck screen, click Custom Study and pick a goal:

Increase today's new card limit — study extra new cards beyond your daily cap.
Increase today's review limit — get more reviews in when you have time.
Review forgotten cards — drill cards you recently lapsed on.
Review ahead — study cards due soon, before they're technically due.
Preview new cards — see upcoming material early.
Study by card state or tag — focus on a specific tag or selection.

⚠️ Watch Out

Filtered decks and Custom Study are for specific, occasional goals — an exam, a weak topic, a catch-up. Don't use them to fight the scheduler every day. If you find yourself "reviewing ahead" constantly, you're undoing the spacing that makes Anki efficient. Trust the normal schedule for daily work; reserve filtered decks for when you have a real reason to deviate.

🛠️ How To: Set Up a Clean Structure for a Subject

What you'll do: organize a subject the sustainable way — one deck, topic tags, and search-driven drilling — then use Custom Study to focus on a weak topic before a test.

Step by step

Make one deck for the subject. Create a single deck like Spanish. Resist the urge to make a deck per chapter — you'll tag instead. Add subdecks only if you truly want to study a portion as a separate session (say Spanish::Listening with different daily limits).
Tag notes by topic and chapter as you add them. Give each note tags like chapter-3, verbs, or high-yield. Use hierarchical tags (grammar::tense::past) if a topic naturally nests.
Study the whole deck day to day. Just click Spanish and review. Everything interleaves, and the scheduler handles timing across all topics.
Before a test, find the weak topic with a search. Open Browse and try something like deck:Spanish tag:chapter-3 -is:suspended to see exactly what's in scope.
Drill it with Custom Study. From the deck, choose Custom Study → Study by tag (or "review forgotten cards") to build a temporary filtered deck for that chapter, cram it, then delete the filtered deck so the cards return to their normal schedule.

💡 Tip

If you're migrating a mess of many small decks into one clean deck, select all cards in each old deck in Browse, add a tag that records where they came from (e.g. chapter-2), then use Change Deck to move them all into the single parent. You keep the organization as tags and gain unified, interleaved reviews.

Best Practices

✅ Do's

Keep decks few and broad — one per subject or study session is plenty; it keeps reviews interleaved and sustainable.
Tag generously — tags are free, flexible, and don't touch scheduling, so label anything you might want to filter by later.
Learn a few search operators — even just deck:, tag:, is:due, and - unlock most of Browse's power.
Save searches you reuse — turn your common queries into one-click sidebar filters.

❌ Don'ts

Don't make a deck per chapter or topic — that fragments your reviews and is exactly what tags are for.
Don't confuse suspend with bury — suspend parks a card indefinitely; bury only hides it until tomorrow.
Don't lean on filtered decks daily — constant "review ahead" cramming erodes the spacing that makes Anki work.
Don't forget suspended cards exist — check is:suspended now and then so nothing you meant to study is stuck out of rotation.

💡 Pro Tips

A quick tag:none search once a week catches notes you forgot to tag while the context is still fresh.
prop:ivl>=21 shows your "mature" cards — a satisfying way to watch your durable knowledge grow.

📓 Learning Journal

Keep a journal as you work through this guide — digital or paper. After each part, jot down:

Key ideas you learned
Things that clicked for you
Questions or confusion points to revisit
Ideas you want to try
Your progress and how you feel about it

✍️ This part's prompt: Sketch how you'll organize your own material. What are your one or two decks? List five or six tags you'd actually use to slice them (topics, chapters, priority). Then write one search query you can imagine running before a test or review session.

📝 Part Summary

🎓 Key Takeaways

A card lives in exactly one deck; subdecks (made with ::) let you study a parent (all children included) or a child alone.
The core principle is few decks, many tags — decks decide when you study, tags decide what a card is about.
Tags attach many labels to a note, support hierarchy, and never affect scheduling.
The Browse window plus search operators (deck:, tag:, is:, prop:, -, OR) let you find any slice of your collection instantly.
Suspend parks a card indefinitely; bury hides it until tomorrow; filtered decks and Custom Study cram or drill temporarily, then return cards to normal.

🎉 What You Can Now Do

You can structure a growing collection so it stays fast to review and easy to navigate — a handful of decks, a thoughtful set of tags, and the confidence to pull up exactly the cards you want with a search. You also know how to pause, flag, and drill cards deliberately, so a big exam or a stubborn topic no longer means fighting Anki's schedule.

❓ Common Questions

If everyone says "few decks, many tags," why do decks even support subdecks?

Subdecks earn their keep when you genuinely want to study part of a subject as a separate session — different daily limits, a listening-only drill, or a "hard pile" you attack on its own. They also let you apply consistent deck options to a whole subject. The advice is really "don't use decks as a filing system for topics" — that's the tags' job. A couple of purposeful subdecks are fine.

Do tags change how often I see a card?

No. Tags are labels for finding and filtering only — they have zero effect on scheduling. A card is shown based on its own review history and your deck options, never because of its tags. That's exactly why you can tag freely without worrying about side effects.

I made a filtered deck and now I'm worried I broke my scheduling — did I?

Almost certainly not. Filtered decks borrow cards and return them, restoring their normal schedule when you empty or delete the filtered deck. As long as you delete it when you're done (rather than leaving cards parked in it forever), everything goes back to normal. The one thing to avoid is using filtered decks to "review ahead" every single day, which erodes the spacing benefit over time.

🔭 Up Next

In the next part, we'll look at working with decks other people made — how to find, vet, and import shared decks from AnkiWeb — plus importing your own cards from CSV and exporting decks and whole collections for sharing and backup.

📚 Additional Resources

docs.ankiweb.net/searching — the full search-syntax reference
docs.ankiweb.net/filtered-decks — filtered decks & Custom Study in depth

🌟 Keep Going

Organization is quietly one of the biggest reasons people stick with Anki long-term — a collection you can navigate is a collection you'll keep using. You now have the tools the power users rely on. Come back to the search table any time; nobody memorizes it all at once.