Linux Mint is a really good starting point. It can get you acquainted with software manager, synaptic package manager, and terminal.
There are plenty of others as well. Opening a fresh topic and asking for recommendations can be a good place to start.
The information they will ask for is make and model of pc/laptop, ram, cpu, hd size, any other details which are pertinent.
Also be aware that you can download a Linux 'iso' and then 'burn' that to a usb stcik....boot the pc/laptop to that usb stick and actually try the Linux distro before you install it.
It runs in the ram....not the hdd....and it causes no problems to the rest of the pc/laptop.
First things first......open a fresh topic....let us know the specs of your pc/lappie......we can take it from there.