Where to find Code base for Pixhawk 4

I was looking for something similar codebase   for Pixhawk 4 as it is given for Ardupilot  ( link below):

http://ardupilot.org/dev/docs/learning-ardupilot-introduction.html

Can anyone guide me . 

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Where to start for begineers

I am  a electronics professional.with 6 years of exp .I am interested  in learning to design and develop  my own quadcopter,I am  quite familar with microcontroller programming (C program),the electronic hardware .I would like someone to help me whic

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