The following is a very eclectic selection of individual blog posts that I can highly recommend and consider to be evergreen content, i.e. still interesting years from now. Of course this is not aspiring to be complete or a proper ranking in any kind of way. But each of these blogs tends to have a lot more great content, so make sure to check out their archives.
Pmarchive - Why not to do a startup
The basic principles of effectuation -How to use what you already have to become more innovative
Applied Philosophy, a.k.a. "Hacking"
What to do if your startup is about fail (or "Don't Stop Believing") - Jason Calacanis
Managing Your Startup Board - A Short Presentation
Eight People You'll Meet on Your Board of Directors
Don't Over-Optimize Fundraising