This is Dunning Kruger in effect. You actually know way more than you think because you’re more aware of what you don’t know than a total beginner.

Also, as far as wanting to switch back goes, That’s a path of least resistance. For a multitude of reasons, stock Windows is simply easier to use than Linux for most people. Especially if you’re already used to Windows’ workflows and its particular quirks. And somewhat ironically, Linux is harder to adapt to if you’re a power user. Power users tend to use their PC for more things than a basic user does, and therefore need to configure more things to work properly.