Tech and repair guides used to be found in magazines or in books [i.e. Zinn and the Art of Bicycle Maintenance]. The vast majority of that information is now captured on the internet, free to anyone who cares to look for it.
This is pretty much everything you need, except for major suspension rebuild workflows. Filter based on the thing you’re trying to fix, read the step-by-step instructions, enjoy.
So. Many. Awesome. Tips. If you have never built a wheel, you should give it a try. It’s easier than it looks, and the first time you get that wheel spinning round and true, you’ll feel great.
This is a little hit and miss, but there are nuggets of gold among the bros and braaaaps. PB used to have something called Tech Tuesday with random tech advice, but they seem to have left everything in the Mechanics forum now.
I’m totally serious. Just Google it. You can type in something like “How do I change the oil on my Fox 36?” and you will be presented with a bunch of good options, including videos of the procedure. Youtube is fantastic for how-to stuff, and worth a check – more and more companies are using video to illustrate maintenance procedures for their products.