More test cases

Lessons are great, but hit or miss. Some are high quality articles, others seem like no-thought notes

i like the challenges! keep them up.

Challenges are great. More would be awesome :-)

Need cloud related topics for system design..

A few concrete asks that map to what folks mentioned:

• Stronger editorial bar for lessons: clear learning objectives, a full worked example, and a “reviewed” badge. Avoid note-dumps.
  
• Challenges: more of them, organized by patterns (two pointers, DP, graph, etc.) with a progression path.
• Test cases: beef up edge cases and randomized/fuzz tests. Show categories of failing cases (e.g., “overflow” or “empty input”) without revealing answers.
• Explanations: at least two approaches per problem, with trade-offs and Big-O, plus a pitfalls section.
• Hints: tiered hints (nudge → approach → complexity) before revealing solutions.
• System design with cloud focus: hands-on mini-labs (queues, caches, rate limiting, sharding), AWS/GCP primitives, cost/capacity callouts, and annotated diagrams.
• Practice mechanics: spaced repetition for missed problems, timed mock rounds, and lightweight streaks.
• Review/mentorship: async solution reviews or scheduled office hours; curated mentor directory instead of cold outreach.
• Tooling: in-browser debugger, consistent time/memory limits across languages, downloadable starter templates, and a local CLI runner.
• Feedback loop: “this is ambiguous/incorrect” button on every lesson with visible resolution status.