I can’t offer any resources other than what’s already well known, but I can say that there is no better way to learn than just starting projects.
If it’s something you want to build then you’re more motivated to learn because it’s something you enjoy.
I am a software developer now, but it took me way longer than it should because I just kept consuming knowledge but nothing really connected until I started actually building things.
So you could set up Linux servers headless, Practice admin tasks until comfortable. Using cloud for building networks and implementing security is great fun.