I gained a lot when I learned the internals of TeX (of LaTeX fame.) Of course I did not learn _all_ of the internals. There's no need. Is (La)TeX super confusi

I gained a lot when I learned the internals of TeX (of LaTeX fame.) Of course I did not learn _all_ of the internals. There's no need. Is (La)TeX super confusing? Sure. Is it what the pros use? Definitely. Also, read "The TeXBook", it is a masterpiece.