Study notes

Query syntax, filtering, sorting, relationship queries and the patterns interviewers expect you to write from memory.

COUNT, SUM, GROUP BY, HAVING, AggregateResult in Apex and the date literals that keep queries readable.

Data types, sObjects, List/Set/Map patterns, DML vs Database methods and exception handling.

The limits every interviewer asks about and the before/after code patterns that keep you under them.

Trigger events, context variables, before vs after, one-trigger-per-object, recursion control and addError.

What happens, step by step, when a record is saved — and why it matters for triggers, flows and validation rules.

Future, Queueable, Batch and Schedulable Apex — when to use each, with examples and limits.

Test classes, data factories, startTest/stopTest, assertions, bulk tests and mocking callouts.

Sharing keywords, user mode, CRUD/FLS enforcement and preventing SOQL injection.

HTTP callouts with Named Credentials, exposing Apex REST services and Platform Events.

Component structure, decorators, calling Apex with @wire and imperatively, events and Lightning Data Service.