I’ve used a lot of distributions over the years, and I don’t think you have to worry about a different set of commands across most distributions. It’s some variation of distropkgmgr followed by command, where command, where command is generally one of installupgraderefresh/updateremovesearch to name the most common. If you use a software frontend like gnome-software or discover, you don’t even need to worry about command line differences.
The only exception to that is nixos, which I wouldn’t recommend to someone just switching. It is very cool, just needs more experience.
The shell commands are the same one installed for the most part.
Out of curiosity, are you planning to use a different os when your ssd arrives? I switched from Ubuntu to endeavouros (Arch) to Opensuse tumbleweed on my primary laptop (i9 processor), no complaints 😁!