I'm on the fence about posting this, because I am not sure if I can post it.
https://www.coursera.org/ offers courses from all the major college universities across the globe for free. When you attend the courses, you are attending the same online course that others who pay for the course attend. However, instead of getting credit for the class, you end up with a certificate of completion.
Not all classes are offered for free either. But major colleges from Japan, the UK and the USA are all included among their providers. It's being done to help promote education for those who want to expand their minds.
I don't think it hurts to keep learning. Some of you are going to college now so it may not be in your best interest to do these courses. But hey, if it helps some of you and gives you a productive use of your online time

I say go for it.