I read a lot, so when I was trying to first get stuff figured out I read a bunch of different books about diet. And closely followed a bunch of podcasts revolving around nutrition.

Off the top of my head: multiple different Michael Pollan books, a couple about blue zones, some books about evolutionary diets.

As for podcasts, I preferred more data centric diets with researchers/doctors than "influencer" types.

Layne Norton, Huberman, Peter Attia, Andy Galpin are a few I've been following for a while. I love all of their information, but it was still pure carnivore that was the most helpful tool in all of my dietary experimentation.