I feel like I still struggle with hands a lot, but I decided to try breaking it down as best I could for you ^^
The #1 first and most important advice is just to draw a lot. Struggling to draw hands? Fill an entire page with hands. Now another one. Any time you feel stuck on something, draw a bunch of that thing. You can't get better at drawing something if you avoid drawing it.
Hands are confusing because beginner artists especially have trouble with complex three dimensional objects. The best way to think about hands is to break them down into simple shapes.
The palm becomes a square, and fingers should start out as a general shape before being broken down into individual fingers.
Try not to jump into detailing hands right away and try to get the general shapes down first.
If you're struggling to learn the shapes of the hand still, try drawing Mickey Mouse hands! Seriously. I'm not joking. Mickey hands are the perfect simplified hands- all shapes, but still very expressive. Drawing real hands can easily look too stiff- cartoon hands will help you learn to be expressive while making it simple to understand!
This isn't super in-depth or anything, but I hope it helps some! ^^;