What sites can I use to learn?

Just as the title says. I’ve been doing middle/high school physics, chemistry, biology and math for about little over 2 months now. Whenever I want to make sure I understand something or reassure myself I actually understand it, I’ll go to YouTube and read a little deeper.

Are there any alternatives I can use to learn outside of khan academyIf there aren’t any free ones, I don’t mind paying as long as the service is good and I can actually learn from it. All the STEM apps are “learn *certain topic* in a week!” which is obviously bull. So yeah, I’d just like to know of any alternatives so I’m not learning from just one site.

Submitted May 22, 2026 at 06:39AM by LavaFromLaniakea https://ift.tt/kguF4z6