Ask HN: Resources, Mentors, Advice, etc for advising startups

Hello everyone!

I wanted to check in with the community and see if anyone could direct me to any resources or mentors or social networks for learning about advisory roles with startups. Or any advice in the discussion would be great too.

I've founded 2 companies and worked as an engineer for the last 10 years with several big names, so recently I've had several startups approach me about taking an advisory role...

And I have no idea what is expected of me, haha. I want to be able to provide them with true value and prefer to develop a sort of "playbook" for certain things, but I'm just not sure where to start.

Any help would be much appreciated!