How was this created?

[prettydecent88]

https://www.instagram.com/p/B9Xs1pUDp0A/

I've used a pen tool so far to create these blob like shapes, and then I try to apply a transform effect but it's not moving like this video. Any help would be appreciated 

[RobShultz]

Maybe mask the white layer with the pen tool, type M for the mask path stopwatch and adjust and keyframe the mask over time.

[prettydecent88]

do you know any good tutorials that helps understand what you recommended? thank you again