#learning

Curated list of articles, videos, courses, and practice sites for learning algorithms, data structures, and cryptography math.

200Lab's free browser game at systemdesign.200lab.io. You place components, the server simulates the traffic, and a level passes only inside its success, latency, and budget limits, with up to three stars for a cheaper design.

sys0.in is Rakesh K's system design course, still being written: a public syllabus of 19 modules, two lessons and two labs marked free, and a yearly founding membership. Checked 2 November 2026 from this network: the founding year was shown as ₫1,408,525, opening a lesson still asked for a Google sign-in, and payments go through Dodo Payments.

Syscraft is Nguyen Thanh Minh's hosted system design lab at syscraft.app: draw an architecture, run simulated traffic, and pass graded challenges. Checked 2 November 2026 without an account: the marketing page lists 7 topics and Pro at $9 a month through Lemon Squeezy, while the learn index lists 42 lessons and the challenge index lists 19.

The Future of Software Testing is Katalon's manifesto and discussion series at thefutureofsoftwaretesting.com. Checked 2 November 2026: four named contributors, a September 2026 manifesto, two published articles, two titles still upcoming, and a how-to track marked coming soon.