I agree this simple advice will get you very far, and from then imo, you can pick specific goals you want to work on, flexibility, strength, etc.

I would say out of all the points listed, sleep is the most important and the one where all health habits will follow from.

www.leangains.com is a great resource for a simple intermittent fasting protocol. Martin seems to really do his research, and he's in incredible shape which gives credibility to his method.

As for where I go personally for learning about health, I have found personally, it's better to just try something, see how you feel and refine it.

(unless you have a chronic parasitic infection that western medicine can't detect with urine and stool samples. Then you need to try the 'weird' stuff in traditional chinese medicine.)

Agreed, and to expand on your last bullet point, since someone might not know where to start: God, family and community.

The meaningfulness part comes with living for someone other than yourself, living in service.