At some point during the installation process, a user can select to install a bootloader or not. I think it would be helpful to add some extra information on helping a user decide between these two options and what happens when selecting either of them. If you are aiming for "everyone" and especially beginners, few have heard of the word "bootloader". Leaving it out would simplify it too much. Tooltips don't look good either. Maybe there is a way to integrate a Help button in the installer. Clicking Help could then reveal extra information such as a short explanation of the available options or technical terms which are used during the installation process. The same applies to the encryption options.

TL;DR: The installer should be as accessible as possible, however, without taking away customization options during installation. A dedicated help button could add extra info to explain different choices to be made during the installation process.