The site was impossible to use on FF mobile without using desktop-view. https://www.explanations.app/dat153qkJtTcHf9Fbm1B/overview, for example has the content frame as a slither on the right.
Signing in with Google and getting a different name is disconcerting.
It's not clear what a "server" is?
I searched "electromagnetic" and "electro-magnetism" but got no results ... "Electricity and Magnetism" is one of the videos though. Robust search is essential.
On one page there were a few "untitled" blackboards; allowing them to be untitled seems bad. They were empty, suggesting some moderation/UGC vetting will be needed.
It's important for college-students to be able to determine the college-level content from the other content. You say it's an open platform, how does one readily see only college-level content?