For a few years, MIT published its courses on the Internet in a project called "Open Course Ware (OCW)".
Last year, online courses increased more and more.
There are many websites have offered many courses online on the Internet for free, and you can get a certification.
I have used websites like edx.org and coursera.org.
I took the electronics course in edx.org last year and enjoy.
Edx.org website has powerful tools that can help me to learn like a real course.
In the electronics course that I have taken, this website had a powerful simulation and to make my simulation on that website all I need was a browser.
Edx.org organization has made the code of that website open source (open source means any one can read a programming code).
Not like before, the internet now full of a massive amount of courses on any kind of fields.