Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
In this tournament after many qualification rounds, each one of the 24 departments in which Peru is politically divided, qualify a team. Those teams plus the team relegated from First Division are divided in 6 groups by geographical proximity and each group winner goes to the Final round, staged in Lima (the capital).