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48+ curated questions with the same answer shape every time: quick recap, deep dive, pitfalls, and follow-ups. Coverage includes caching basics, client server model, comparisons, databases sql vs nosql, and more.
Suggested path
Topics follow a teaching order. Each answer ends with a clear Next question control so you can move forward without hunting the list.
Freshers are not expected to design Twitter from scratch, but they are expected to understand the building blocks of web systems. This module covers the client-server model (what actually happens when you type a URL), HTTP fundamentals (request/response lifecycle, status codes, headers), the difference between SQL and NoSQL databases and when to use each, what caching is and why it matters (cache-aside pattern, Redis as a session store), and the intuition behind horizontal vs vertical scaling. These concepts are the foundation for the system design questions that scale with experience — getting them right at the fresher level shows architectural awareness.
Full catalog
Topics are ordered for learning. Within each topic, rows are numbered 1–48 globally so you always know where you are. Collapse topics if you want a lighter view — use Expand all when you need the full list again.
Numbers 1–48 follow the order we recommend — click any row to open the full answer, or use the sticky Next link at the bottom of each page to go Q1 → Q48.