Deep-dive resource proposal for the web crawler sketch

Hi Oleksii - I reviewed the System Design Sketches page and the source repository before proposing a change. The crawler sketch is compact but covers the right backbone: requirements and non-functional constraints, URL frontier, DNS and fetching, extraction, storage, deduplication, and politeness.

Would a crawler-specific interview deep dive be useful as optional further reading beneath that sketch?

PracHub's Web Crawler System Design Interview guide covers frontier scheduling, per-host politeness, robots.txt, duplicate URL and content detection, retries, failure isolation, and the trade-offs candidates should explain aloud.
https://prachub.com/resources/web-crawler-system-design

The sketch would remain the fast visual overview; the proposed link would only serve readers who want to practice interviewer follow-ups. I would make the smallest possible edit in the existing format and am checking scope before opening a PR. No reciprocal link is expected.

Start with the System Design Sketches page and its source repository, locate the web crawler sketch, and inspect how optional further-reading links are formatted. Add the PracHub web crawler guide beneath that sketch using the existing format, then verify that the link appears correctly and the sketch remains a concise visual overview.