Making my summer effective through something online?

Hi, I was wondering if is there any like summer programs that are done through online?
I’m already planning to take several online classes, but I want to keep my summer busy in order to improve my chances for next year’s admissions.
Any suggestions?

Thank you!

I think it depends on what you are interested and at what level, time commitment, etc. Mind sharing a little more information?

@CollegeMan91
im kinda interested in either business or engineering (different i know). I feel like I want to devote most of my summer, not only to help my apps but also to improve my understanding of those topics you know!