Git is one of those technologies where it's super important to get a good grasp of how to internals work. Once you got that, it get easier to answer git questions for others or yourself, and to read the documentation or man pages, as you know what is happening.
With how software devs use git, it's 100% worth it to read a good book on it.
I would also love to get some recommendation on git. I'm using the github desktop gui atm (very new to this world), but I'd like to start learning git. it is kinda intimidating.
https://github.com/FredrikNoren/ungit is one of my favorite Git tools. IMHO it is the perfect compliment to the command-line interface since it provides a nice visual model of your commit graph and branches. The graph is interactive so you can use the GUI for things like merging, rebasing, cherry-picking, etc (very nice for visualizing those changes). But at the same time, the Ungit interface mostly just stays out of your way unless you need it. It does not try to force you into a certain workflow or usage pattern.