Maybe this helps?
In this thread I'm going over how to install Zorin OS with a dedicated partition for /home. You can repeat the same process for any other partitions that you want to, for example for things like /var or /swap.
It's also possible to do this without having to re-install the OS, but I would prefer to do that anyway just to make sure I'm setting things up correctly.
Remember this is something that you can do, but don't have to. You'd have to make the decision on whether is worth it for your particular use case. And if you are not sure, that probably means you don't need to go through any of this.
For example, having a dedicated partition for /home means your personal files will be left intact even if you install from scratch. This is useful when installing another distribution, including major versions of the same one i.e. Zorin OS 17 → Zorin OS 18. This can also be used in a more involved setups with external drives and whatnot, but that's a whole other story.