You can earn points in almost all the actions you take in the app.
From watching videos
You earn 1 point for evey video you watch
From reactions & comments
You earn 1 point for every vide you react be with a Happy or a Sad reaction
Watch out as interacting with posts will also earn you few points, commenting and interacting with the content creators.
From submissions
When you submit content you can earn points if the submission has great quality, also, be aware that if you submission turns into a posted video you also earn from people watching it, it's one of the best ways to earn a lot of points.
From Assignments
Assignments will give you a fix amount of points for every submission that turns into a post, so besides the points from a regular submission you also earn the assignment reward