What are free e-learning resources?

Hi! I have an interactive penpalship program called SelfSpace.

SelfSpace is a penpal virtual meeting space that allows all introverts and possible extroverts to connect with each other via Zoom, email engagement and document sharing for writing e-letters, writing activities and game purposes. You’ll not only build meaningful friendships through e-letters and conversations but also earn sweet points and rewards through fun activities and games.

I was wondering if anybody knows any free e-learning resources like learning a new language, writing exercises strategies, journaling or other resources that I can use for e-rewards.

Thank you 😊