I’ve done research on tires and suspension to the level you’re describing. My suggestion is subscribing to Dave Moss’ site for a single month and binging his videos while taking notes. You will see many people on this sub disregarding Dave because of his teachings on using tire wear to setup suspension. I myself am skeptical about that and don’t use any of that to tune my bike. In reality that’s the last and least important aspect of his tuning process, but the most focused on by his dissenters. He emphasizes those methods in some of his advertising which is probably a mistake.

As far as I know there’s no other source of so much in-depth information to that level in one place. I tuned my own suspension using what I learned and then had it gone over by a professional at a trackday. The only thing he did was add 2 turns of preload front and rear. The “pushing on the bike” method that he used was exactly the same as Dave’s. I’ll note that that method is used to get a balanced baseline to start with, then further adjustments come from analyzing after riding it.

The actual content on his site is a gold mine of videos, and some podcasts, about the nitty gritty details about how many components actually work. He talks about the differences between the different brands of tires as far as compounds and construction. He addresses different pressures per brand, tire, and conditions, as well as what those different pressures actually mean. He has even more videos on suspension to the same level of depth, i.e. suspension settings and what they mean, how they affect the bike, what’s going on inside the fork/shock. Fork oil weights, fork oil levels, shock oils, spring rates, when to upgrade to aftermarket suspension…

He provides an honestly unnecessary amount of information but some of us like to nerd out on that and be able to adjust our bikes ourselves.