Hands are really tricky, and the problem is I LOVE drawing them, so it comes natural to me, but I'll try my best to explain!
Draw an inverted trapezoid with a round upper side. That is very important to get the length of the fingers.;
Add an inverted triangle on one side of the trapezoid. Depending on the side, you can draw left or right hand!;
BALLS! Following the shape of the upper half, draw an arc and place 5 little circles on it. One MUST be on the triangle, two must be close to the edges of the trapezoid, and the other two must be at the same distance (more or less) from the two circles at the sides.
Then, draw another arc above the first one but covering only the 4 circles on the trapezoid;
Add lines! The circles are the joints, so you need to 2 "curve" the lines there (or you can go straight if you want to draw a full hand signing "stop"). The tips of the fingers are round, usually, I make them sharper for females and rounder for males, but you can mix things around!
PERSPECTIVE! By putting in perspective trapezoid and triangle, you can draw any type of hand in any position, basically!
TIP: I suggest copying or tracing hands from photos to help your hand muscles and brain get used to and confident with the movements needed to draw hands. If a pose is too difficult, I usually snap a photo of my hand in the pose I want and copy it (or trace it if I get too frustrated, lmao).
No Trapezoid here, we square up like kids!
Draw a square with VEEERY soft angles, and add circles on the top and side for the fingers. Side one is shorter, other ones follow an arc above them (like the normal hand)
Wave is the way! Before drawing, exercise drawing waves, because that's the key! They must be larger on top and smaller on the bottom side;
Or, you can draw 3 circles between the main 4 fingers on top of the square and a little triangle between the thumb and the index finger;
Connect everything following the lines! Remember the waves: bigger on the tip, smaller on the bottom! No straight line, curve everything!
Oh, also wrists are just like... sticks, lmao, best feature of the show!
Remember, if a pose is too hard, google that stuff and copy or trace it to exercise and get used to it!