In web pages like https://www.ultimate-guitar.com/ you get the chords of a song (see this for an example). And that's enough if you are aiming to be a campfire guitar player. But when looking for content to quickly know the structure behind a song (secondary dominants, chord degrees and so on), I am running into lots of trouble finding them.
How do real guitar players approach this problem? Do they analyze every song from the tab version or do they know about a secret repository where they keep all these analyzed tabs?
Thank you in advance