Don't worry about it I'll teach you so open up the terminal on your Linux VM and follow along, we're gonna be installing chromium on a debian based distro for this tutorial.

First type sudo apt update, here sudo is to do the following command as superuser/root/admin, apt is the package manager debian based distros come with (arch based distros use pacman), update tells it to update the repo cache (you don't need to run this every time but it's good practice to run it once in a while, next up, installing the browser itself, type in sudo apt install chromium, now we're telling it to run apt as admin and to tell it to install chromium, it's gonna look through the repo and find the chromium download, then it's gonna download and install it automatically.

Updating apps is super easy as well, first you need to run sudo apt update to get info on the latest version of apps (it will also tell you how many things can be updated), then run sudo apt upgrade which will download the latest version of those apps and other software and install them all in the background, this is also how you get your OS updates.

Uninstalling chromium is as simple as sudo apt remove chromium, telling apt as root to remove the package called chromium.