Went through YC myself. This playbook does a great job of describing the lessons taught in the program. A must read for any startup founder.

I bet this "product" will be the top upvoted today. This is only one thought I can share so far. It needs to be readed, evaluated, applied. Paul Graham's articles are quite useful as well. I am curious how much information is repeated in the playbook. Even though some details could be the same, but everything changes, and some pieces of advice should be refurbished to be relevant at the present time.

I think this is better than reading lengthy books,.....just what we needed!! :) Not read fully yet. But I'm sure, coming from YC and Altman, it will be worth a read