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Learn Apex the practical way

Hands-on lessons with interactive examples and short, readable code — so you can build real Salesforce solutions with confidence.

Apex lessons

Access modifiers
private through global — short rules, full class examples, and a live “who can see” grid.
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Collections
List, Set, Map — read Apex-shaped snippets, then play with the sandbox.
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SOQL basics
Build a SELECT … FROM … WHERE … LIMIT query — watch the string and the binding pattern.
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Trigger context
Insert, update, delete — see which Trigger.new / old / maps exist for each event.
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Exceptions & nulls
Walk try/catch/finally paths and compare null checks vs String.isBlank for real data.
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Sharing in Apex
with / without / inherited sharing — mini org simulator, live class shape, scenario cards.
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Permission sets
Stack profiles + sets on a toy user — see CRUD merge, field-level badges, myth cards.
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Apex best practices
Governor toy bars, SOQL/DML flip code, tap-the-safe-snippet quiz, habit checklist.
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Sharing rules
OWD + peer rule on/off — see when Bob can see Alice’s Account (toy model).
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OWD
Organization-wide defaults — Private vs Public Read vs Read/Write baselines.
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Apex managed sharing
Toggle a simulated AccountShare — see Apex creating share rows in code.
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Order of execution
Step through triggers, validation, automation — simplified pipeline.
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Variables & data types
Integer, Decimal, String, Boolean, Id, Date — tap each for notes and snippets.
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DML operations
insert / update / delete / upsert / undelete — flip examples, match op to story.
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Bulkification
Slider batch size, naive vs bulkified — watch SOQL/DML counts move.
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Governor limits
Toy pressure dial filling SOQL / DML / CPU / heap bars — mitigations list.
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Static vs instance
Tap to increment — instance vs static counters side by side.
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Constructors
Overload picks — which new Service(...) maps to which constructor.
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Polymorphism
Dog / Cat / Bird — runtime type picks speak(); virtual/override snippet.
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Context variables
isInsert, isUpdate, isBefore, size, operationType — tap event; table updates live.
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Trigger.new vs Trigger.old
Sliders for old vs new Amount — “changed?” panel flips when they differ.
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Recursion prevention
Toggle static guard — simulate save; counter explodes or stays controlled.
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Trigger order of execution
Shuffle trigger names — reveal alphabetical run order (same object).
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Future methods
Sync vs @future box — fire async (toy) and see the separate transaction idea.
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Queueable Apex
enqueueJob — queued → done animation; minimal Queueable snippet.
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Batch Apex
Slide total rows + batch size — watch execute() count update.
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Scheduled Apex
Presets (hourly / daily / weekly) — cron string and plain English.
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Chaining Queueables
Next step — Job A/B lights up as you walk the chain (toy).
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