assembly x86 64bit (linux )

Hello experts    I'm looking for long-term tutor  , to help me understand assembly 64 bit on Linux  e my professor use his own library to make the codes shorter as he said but I didn't understand it and how it works  I need an expert who can understand it and teach me to write assembly as my professor because many tutorials online has different structures than that we learn in the class

please look attachment to understand the code