Hands are hard. Not real hands - they're kind of fleshy and squishy. The insides are hard though, but that's not what I'm talking about! Drawing hands can be hard.
I'm still working through the Michael Hampton Figure Drawing book and am currently on... hands. One of my least favourite aspects. I still dread drawing them, but I think all the practice here and there these past couple of years is really helping!
I've found Michael Hampton's book really helpful, but I've used another source in the past to help learn the hands. Andrew Loomis does a good job, but I've also found Joumana Medlej's tips to be of great help. Also, photo reference is definitely a must!