Online Summer Class Experience ?

Hi everyone, I’m here to hear experiences from online summer class. Right now I’m looking at the UC online summer class
https://crossenroll.universityofcalifornia.edu/sites/default/files/2018-University-of-California-Summer-Online-Courses.pdf

Since I’m seeking for credit via online class, I would like to ask if any of you happen to experiences these online classes before? And Are there any class that considered easy to take during this summer? I mean easy class when I don’t have heavily put most of my week days into the class, instead, I can try to spend like a day to complete many exercises and so on.

If anyone can share experience with me, I’m appreciated your help!! Right now I really need some credits for online course only. Please help me!