This is how I work.
It's important to know HOW the component works, not just the steps to adjust it. Becaue inevitably with all the different makes and models, the steps are not quite exactly the same. But most of the time, they all work the same way.
I was just about to post this (in a shorter and not-as-inspiring way, of course).
Learning, for example, what the limit screws and the barrel adjuster of the RD does helps a lot in adjusting it, instead of just turning screws as the online video you watched said.
A good motivation for learning mechanics stuff is to know that you will be able to fix (or at least partially fix) your bike in the middle of nowhere, when, for example, touring or doing a long ride
