Difference in installing SuiteCRM 8

I wanted to understand what is the difference in installing SuiteCRM 8 from the Administrator guide or from the Developer section.
This is because by following the steps in the Administrator section I can install it safely but if I explore the folder structure it does not match the one presented in chapter 2. Front-end structure of the guide Front-end Architecture :: SuiteCRM Documentation
So I tried to reinstall SuiteCRM 8 as in the Developer section but as reported in a previous post of mine it crashes and fails.
'Core' entry point creation error