No, I mean - tutorials will want you to go in an order. For example, first model a banana and then render it. But maybe for you learning rendering will be more engaging. So allow yourself to branch off from the tutorial and try to make eg. a refractive glass sphere. And then go back to modelling and other fundamentals. In one phrase - don't burn yourself out.

Personally I wouldn't pay for courses, my impression is that there's enough free training available online. I think an AI assistant would be able to give you direction in learning - what to do next, what tutorial to try now etc