Since Manjaro is based off of Arch Linux, it inherits the amazing perk of having access to the Arch User Repository (AUR). If you don't know about the AUR, it's basically a huge repository of community submitted packages. If you've worked with PPAs on Ubuntu in the past, it's a lot like a centralized version of that... but it's much easier and safer as you'll see.
This is a companion discussion topic for the original entry at https://linuxconfig.org/how-to-install-a-package-from-aur-on-manjaro-linux