Hey thanks so much! I use a program called Krita, it’s free, it’s great, it’s got the basics of frame animation which is all I really care about. I guess my best advice is that whenever you start an animation project you might benefit from starting simple and adding complexity later. Animation gets frustrating fast whenever something is off and it gets tricky to fix or “get right” when it’s in the context of all the frames surrounding it. In my fish loops I started with drawing a ball that stretched and flattened as it moved around and then went over it and added eyes, fins etc. to fit the movement. I think I would have gotten frustrated if I started with a whole complex shape and wouldn’t have known where to go next. It’s a muscle though and gets easier as you do it.

Pretty much everyone getting into animation I think finds this ancient series of chronophotographs by Eadweard Muybridge showing a horse in motion

It’s great and a cool bit of photography history, and I made an exercise of it to try and copy it when I wanted to get into animation. I felt it helped me make sense of what is important in making an image move in a fluid way. It’s a fun and not too daunting task, you might want to try it yourself.

Tilting at windmills

Also, if you just animate the bottom half of the horse you won’t have to do as much work, so you should do that

As for the program itself, you can make layers static or add keyframes to them to make stuff happen, click window > animation to change the screen to access that part. Make a drawing, hit next frame and turn on onionskin so you can see where you were the frame before

The krita forums are also really helpful if anything technical goes wrong

Hope this helps! And also wasn’t too much or too little information :)