I found it difficult to learn and understand the fundamentals if I don't really work on the aspects. I have tried a couple of times to write side projects abou

I found it difficult to learn and understand the fundamentals if I don't really work on the aspects. I have tried a couple of times to write side projects about interpreter and OS. They were all small projects so I managed to complete them before I burnt out (somehow I always burnt out from my side projects after 2-3 months and have to pause for another 3 months to get into something new). But I don't think the knowledge sticks with me. I mean, maybe part of them did, but I just can't see why I'd use them in my work. It is sometimes very demoralizing to realize that I burnt out myself multiple times for nothing. I think the most important thing, is to figure out how to get into a position without the knowledge to do it -- I know it sounds stupid, but many excellent developers managed to get that perk and learnt profoundly in just a few months than I did in my 7 years.