HPS-2-FPGA arria 10

I need to create a communication between Arm and FPGA of Arria 10 SoC devkit , i need to send data and receive data, i understand the idea on how to exchange data between them , what i don't understand is the Qsys logic,

i sow a lot of examples and i can't understand the logic behind them; how are the component in the Qsys are related to the VHDL design....

i'm a beginner could anyone please help me ?

Thank you