Fix & Improve
Debugging, refactors and fixing things that aren't working.
Recover when a change broke a working build
Restore the last working behavior, keep recent good work and customer data, then reapply only the change you wanted.
Beginner
Debug exactly what is broken
Turn the exact error you can see into a small, tested fix without rewriting working parts of the app.
Beginner
Clean up an app after many changes
Reduce duplicates, abandoned pieces and inconsistent behavior while keeping the app's working features, data and URLs intact.
Intermediate