ycombinator.com
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Y Combinator is a leading startup accelerator and investor offering seed funding and mentorship to early-stage founders. The site provides program information, founder resources, and a library of essays, talks, and courses (including Startup School) on building lean, scalable startups.
More resources on Lean Startup
leanstartup.co
Lean Startup Co. is the official hub for learning and applying the Lean Startup methodology, offering training, coaching, and practical guidance. The site features articles, case studies, and details on workshops and events to help teams validate ideas, run experiments, and build products customers want.
Lean Startup Principles
Coursera course: Why Scale a Startup?
ashmaurya.com
Ashmaurya.com is the personal site of Lean Startup author Ash Maurya, offering practical resources and tools for product discovery, customer validation, and business-model design. It features blog posts, templates (including the Lean Canvas), and frameworks to help entrepreneurs validate ideas and build startups.