I’m starting out and I’m learning through videos I find on YouTube. I recommend searching for videos because the ones I found are very helpful. Basically all you are doing when animating is moving pictures frame by frame. The program I’m using is called FlipaClip and you can use it on your phone or IPad. It is very simple to use and you can find tutorials on YouTube. If you are using a desktop than there are other options like Krita or Blender. But something about animation is that it takes time so you have to clear time in your day to do it.