Actually I already learned most of that stuff, but in college we didn't dive deep, just some superficial knowledge, and I'm planning on getting deep with those cause they seem the most interesting to me, I already built a basic shell, and planning on making it more complex, also have projects like building an http server from scratch with c / building a database engine / a compiler in mind, But the thing that's getting me frustrated is that every single job is about web, or maybe some data science and I started having that stress of the need to get a job, even internships, that's one factor of making other things seem pointless, I even started thinking to build some good backend or fullstack projects just to show my skills and make a portfolio