I was going to do a post on things to do when you are bored and include completing a Coursera course as one of them but actually the topic really deserves an entry of its own.
If you are unfamiliar with Coursera (or EDx which is also a very similar concept), the website hosts hundreds of courses on a wide range of topics – from data science to political science to personal development courses. The courses are sourced from Universities around the world and usually consist of video content, recommended readings and assignments.