Curiosity Stream:

Any length, Any subject

YouTube Learning:

Ted Ed
Ted Ed student talks
Ted X talks
BrightSide
AfterSkool
How it’s Made videos
The Infographics show
PhysicsGirl
ASAP science
DanceVision Ballroom Dance Lessons

Independent research:

STEM projects
Gymnastics
Dance

Swing

Art practice via tutorials (drawing, mythical creature drawing, cartoon, kawaii, anime, animal, and more!)
Programming (C++, Unity, Python, Blender, C#, Golang, etc)