The main reason why you might want a separate home partition is for easy distro hopping, so you can keep all your personal files when you reinstall/change the operating system. Which is something you may want as a new user, however obviously it’s not too hard to backup your home directory somewhere if you’re wiping your drive for a reinstall.

Only thing is somehow software gets installed on my root partition instead of the home partition I made because people told me so.

How are you installing software? If you are using the native package manager (apt in the case of Mint) it will install to the root partition because it’s installing for all users. If you want to install to your home directory, you might be wanting something like flatpak.