It’s really hard to [accidentally] permanently break Linux to the point of requiring a reinstall.
Here’s a really good tip: Keep a live distro (I use Mint) on a USB drive. If something real bad happens, you can boot into the live distro, and chroot into your OS and do the repairs you need. While also having a live distro with web access and a browser to help.
I broke my GRUB once (or twice) and fixed it again this way.
Keep a backup of your /boot folder, GRUB (or equivalent) configs, etc, also check documentation on Arch wiki for boot process. 99.9% of the time you should be able to fix things to at least get to a TTY after boot.