Back in my teens (mid 20s now), I was very (very) interested in Photoshop to the point where I would consume dozens of tutorials a day and just work on projects for things like forum signatures or post headers and graphics. My "graphic design" career never took off, but to this day I still have muscle memory of certain tasks and actions I've created and still set up my workspace in the same way.
Now that I'm a programmer I rarely find the itch to dive into things like this again. Every now and then, I'll want to create some silly website with a game or something and again I'd find myself spending late nights just working on it. I've realized that the fact that I "know something" isn't what drives me, it's that I'm interested in what I want so much that I'll learn anything just to get to do it.
Lately, I've been starting to feel the itch for doing something related to baseball (again, something I love), like data analytics or amateur scouting or something. I have no idea how to get started, but I just know I want to. I hope I find tutorials from people who are just as excited to share information as I am to absorb it.