[johnmax]

I was in a similar situation:

(1) I did one thing at a time, based by a tutorial which involves exercises (eg coursera princeton blockchain or coursera andrew ng machine learning). you must do complete exercises, otherwise you forget so quickly

(2) I overestimated the value of such learning: Usually you can only scratch the surface, and forget it after a time. This made me reevaluate the value of such endaveaors. I would rather go now with learning something that I will use daily or at least weekly on the job