Help with...everything?

I just moved to linux for the first time and I'm having issues installing discord and mullvad, among other things, and the bazaar application just reads "offline" and nothing else.

I can't figure out the terminal and copy pasting the codes from websites doesn't do anything but give errors. And I have no idea how to install .rpm files that just open more files.

I also can't figure out where to go to get the Linux equivalent of the "my computer" screen, to easily access and look at storage drives.

I installed the KDE version on a Lenovo Legion 7i Pro Laptop if it makes a difference.

Can anyone walk me through what commands I'm supposed to input to install things on Linux, and how to get the Bazaar fixed?

I can't install the Nvidia app either.
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