How to frame-by-frame animate an object along a path? Let's consider the movement of a paper airplane. Firstly, I draw a line along which the movement will take place. Then I define the speed of movement at each stage of this path. After that, I draw basic frames and supplement them with intermediate ones. This is a simple and effective method, try it and you will definitely succeed!
I hope it was useful or interesting for you! Thank you and see you soon!