How to specify the Configuration file when writing scripts for MacBook Air computer?

I am learning now how to write scripts on my Apple MacBook Air computer.
I understand that it is related to .zshrc file.
I will have to create my own C functions.
I will put functions in a directory ---->>> MyOwnFuncDir
My understanding is I have to secify this MyOwnFuncDir in some kind of Configuration file.
But how do I let the system know what is the name of this Configuration file and where is the file located?

This is the content of the .zshrc file, I have created so far:

export PATH=$PATH:/Users/grigoryzubkisecho  "#1"chmod   755 /Users/grigoryzubkis/RunItchmod   755 /Users/grigoryzubkis/simplemenu.shchmod   755 /Users/grigoryzubkis/learnUnix.shecho "#2"