In relation to creating malware, what do you think is more efficient, courses like maldev, sektor7, sec670 or practice with suffering, in this case reading books until you understand, articles, YouTube?
This is very personal and varies from person to person. What works for me is: reading books, articles about a specific technique I want to implement, reading reports, analysis and studying the source code of others malware.
tbh i dont rlly like YT stuff and all these courses of malware def. i say better learn by yourself, if u want to create stealer then what should it do? main func of the stealer is just to grab data, sounds simple right? now you have that understanding what stealer do, so next you should start decomposing your task to small ones ( your task == grab data from somewhere ), then u should learn how it should grab data? how it should send to the server? how to decrypt that data? and so on. u wont learn the whole process just by watching YT and stuff.