Every ticket interview, tried cold before the walkthroughs

The symptom from each of the 45 tickets. Say the cause and the fix, check the key points, and get the course chapters behind every ticket you miss.

More in the SQL tutorial

More courses

  • Jobs, linked to lessons — Browse jobs where every requirement links to the chapter that teaches it. See how ready you are, how long the gap takes to close, and which listings look stale.
  • Match a job post to courses — Paste a job post. Each skill is matched to a track here and put in learning order, foundations first.
  • React from open source with patterns — Patterns extracted from Material UI, Radix, React Aria, React Hook Form, Redux Toolkit, TanStack, and Next.js — not slides about hooks.
  • System Design — Core concepts first (SQL vs NoSQL, CAP, indexing, replication, sharding), then designs grouped by what carries them: the database, Redis, Kafka, or many services.
  • Microservices — Microservice patterns one diagram at a time: how to split a monolith, how services talk, and how data stays consistent without distributed transactions.
  • Kafka — A beginner-to-senior path through event logs, reliable delivery, production operations, and disaster recovery.
  • Frontend system design — How a UI is sliced when it is a product, not a page: ownership of state, cache, routes, and what happens when the network lies.
  • TypeScript in depth — The type system as a design tool. Inference, narrowing, generics, and the errors that mean the model is wrong — not a catalog of utility types.
  • CSS in depth — See the box, then the page. Visual chapters from the box model through Flexbox surprises, Grid, selectors, and units, then backgrounds, shapes, and visual effects, each with a playground.
  • Accessibility — Foundations first (WCAG in plain words, semantic HTML, lists, alt text), then hands-on HTML labs, a full pass of WAI-ARIA 1.3, and a final fix-the-page challenge.
  • Docker — What an image is, why layers cache, and how containers find each other on a network.
  • Redis — Fifteen Redis patterns, one picture each: cache, session, lock, counter, rate limiter, queue, and when Redis is the wrong tool.