How to Build a Deep Learning Workstation for Free

Everybody who is getting into Deep Learning is facing the same issue. It needs a GPU to train their models on them or they will grow old until they will see any output out of their beloved project (of course there are cloud options, but for hobbyists, it is not the same as developing on your own PC). But, unfortunately, GPUs are very expensive. Nowadays, all PC components are expensive, but the GPUs are the ones that empty your pockets. This is mostly a by-product of mining cryptocurrencies.