Understanding the utility of Projected curves feature and Revolved cut feature in Solidworks

Objective: to design the front fork https://drive.google.com/file/d/1In9uzbR_fPYEvwyb8NtmKrhQZLG8hd_y/view?usp=drivesdk to design the rear wheel https://drive.google.com/file/d/16SkUyV6wXoPI_jwRMjZ_AU2BQL1otwZW/view?usp=drivesdk