Theres plenty! Googling 'after effects shape animation' returned all of these: https://www.skillshare.com/classes/design/The-Ultimate-Guide...

https://helpx.adobe.com/after-effects/how-to/create-shape-ve...

https://cgi.tutsplus.com/tutorials/how-to-create-a-fun-and-d...

https://www.lynda.com/After-Effects-tutorials/Mograph-Techni...