I'm learning C++ using Linux text console (no gui) by g++ compiler, I created wrote the following files:

help.h
help.cpp
main.cpp

I run command g++ help.cpp main.cpp and ./a.out file is created so I run it to test software.
I'd like linking stage because in previous command no library is specified so I'm thinking default libraries are added.
I'm using iostream and cstring libraries.
My study work says it's necessary to add at g++ -l<library> but I ask help to experts