Let me know if you need any help or have any questions. There's a ton of how to videos and stuff, too, if that helps. Like this one should be pretty good for this -
I didn't watch the whole thing, but seems pretty straight forward.
Really the only major difference is how you install programs. In Windows, you simply click a few buttons and it's installed. In Linux, you need actually copy & paste commands into your terminal (think "command prompt" in Windows). So for instance let's say you want to install Brave Browser onto your Linux pc. You would go to Brave's website and navigate to the "Downloads" and look for Linux.
Instead of actually downloading an .exe file that you then run to install it, it gives you the actual command you enter in your terminal window, to download & install the app.
^^^ As you can see it gives you the exact commands you need to install depending on your specific version of Linux.
This is basically the hardest part of Linux. This and a few other commands that will help along the way, are important to learn, but overall Linux has come a *very* long way from the old days.