It isn't necessary to learn about every possible thing available, especially when you're starting out. When I first started sewing decades ago I used universal needles (in various sizes) for everything, and they worked fine. Now I use sharps for woven and jersey needles for knits, and I've tried lots of different types of each, but when it gets down to it, I could have kept using those universal needles and been fine except maybe for some thick canvas types of fabric I've used.
There are also whole categories of things I ignore. I would love to learn how to use a longarm, but I wouldn't use it enough to make it worthwhile to purchase, and there's nowhere close enough to rent one, so for now longarming is out for me.
I try to learn about more things as I go, but what I'm doing now is working for me, so I don't worry too much about all the things I don't know about, because then I would be overwhelmed!