I'm installing alongside windows. My HD has ~1 TB of space. I'm assuming when installing, if I ask the installer to partition 400 GB of space for Ubuntu, this would leave ~600 GB of space for Windows.
But how is this 400 GB used? Will it be used for me to save any random files I end up saving? (e.g. music, photos, apps, etc.?)
Or will it be used for some weird tech reason that I, as a casual user, am not aware of or concerned with?