I would only add to do a regular backups because things can go south on rolling release, especially if you are newbie. It’s pretty common to break your installs for few times if you are new to Manjaro or new to Linux in general. Once you figure out how it works, Manjaro can be a very stable system but it also depends on your hardware. Manjaro runs for years on many our computers but there are some that had system failures after updates so this is a possibility.
So once again, backup, backup and once more backup. Timeshift is helpful to do that.
Generally, Ubuntu based distros could be treated as install and forget, just use the system. On rolling, cutting edge systems like Manjaro are more demanding, although if you learn how to do it properly, it’s easy and simple, at least for some. You must see for yourself if that suits you or not. It’s definitely more fun and more learning experience but some simply want to use computer without playing around the system and packages.
If you decide to keep Manjaro, be part of the community, see update announcements to find and fix potential problems, or report your owns to find help. Learn about pacman and AUR and how to use them or how to resolve potential problems that may arise from using AUR (update incompatibilities). Learn how to update configs (compare pacnew with current configs and properly integrate new features), clear your pacman caches to avoid running out of space. So as you see, there is some learning curve.