What content can I reproduce from Pathfinder?

What content can I reproduce from the pathfinder gaming system. Is it anything from the Core rulebook that isn’t a specific name?

For example, I like the D20PFSRD but the layout and ads annoy me.

I want on my own website to create my own public reference for the Pathfinder classes, feats, prestige classes, all of that jazz. No I’m not naive and am aware of the abundance of content, I won’t be doing all of it but a lot of the Core rulebook in a cleaner way.

What can I “not” copy from the core rulebook onto the site.

What can I “not” copy from other books listed in the Pathfinder OGL.

I understand of course I’ll have to copy and link the OGL from Pathfinders website in a easily viewable location.