Also, you can learn fundamental, intermediate and even advanced topics on CS without a formal degree via MOOCs, like the ones offered by Coursera - some of them

Also, you can learn fundamental, intermediate and even advanced topics on CS without a formal degree via MOOCs, like the ones offered by Coursera - some of them taught by professors from universities that you may not even have the money/time/grades to get in for a formal degree. I was thinking about attending to a CS undergrad course some time ago, but since I'm full-time employed at a very big ("unicorn") startup - an opportunity too good to be wasted -, I opted to take some classes on advanced topics such as Discrete Optimization and Automata theory on Coursera . It has been the best use of my spare time ever.