What each Magento 2 cache type stores, the real difference between cache:clean and cache:flush, how cache tags like cat_p scope invalidation, and how to build a custom cache type with cache.xml and TagScope.
Magento 2 developer, default, and production modes compared: how static files and generated code behave in each, what setup:di:compile builds, safe mode switching, and fixes for code that works in developer mode but breaks in production.
How Magento 2 extension attributes work: extension_attributes.xml syntax, scalar and object types, repository plugins for get, getList, and save, join directives, ACL, and exposing the data in GraphQL.
How Magento 2 setup:static-content:deploy really works: quick vs standard vs compact strategies, -j jobs, locale and theme scoping, Adobe Commerce Cloud SCD variables, and the flags that make Hyva builds fast.
What Magento 2 virtual types are, the exact di.xml syntax, a real custom-logger example, and when to choose a virtual type over a preference or a plugin on Adobe Commerce.
How Magento 2 and Adobe Commerce cron groups work: the crontab.xml and cron_groups.xml files, the cron_schedule table and its statuses, running a single group, and the real reasons scheduled jobs stop firing.
A practitioner’s guide to tuning Magento 2 and Adobe Commerce search relevance on OpenSearch: synonym groups, codebase stopword lists, per-attribute search weight, and the reindex that makes changes stick.
How to test Magento 2 and Adobe Commerce modules with PHPUnit unit and integration tests, MFTF, static analysis, and a CI pipeline that catches upgrade regressions.
A practical guide to tuning PHP-FPM, OPcache, and Redis for Magento 2 and Adobe Commerce: the exact settings, worker-count sizing, and cache split that cut server response time.
How to profile a slow Magento 2 or Adobe Commerce request and find the real bottleneck using the built-in profiler, Blackfire, Xhprof, and New Relic APM.
How Magento declarative schema works: writing db_schema.xml, the db_schema_whitelist.json whitelist, the commands that apply and preview changes, and how it replaces InstallSchema and UpgradeSchema.
How Magento message queue consumers run, configuring the consumers_runner cron job in env.php, running them under Supervisor, and diagnosing workers that die or stall on Adobe Commerce.
