Startup School - How to start a startup, by Y Combinator
On Deck - Business Loans | Small Business Funding | OnDeck
The Y Combinator Database - The definitive database of YC companies with all the metrics
Founder Secrets - Practical advice from the world's best startup founders
Apply to YC (Y Combinator) - Curated collection of resources for founders applying to YC.
Indie Hackers - Connect with fellow entrepreneurs, developers, and bootstrappers who are sharing the strategies and revenue numbers behind their companies.