header and source

Forgive me for the trivial question but i'm a new in c++ world.
I have finished to read a beginner's guide of c++. There is nothing regarding how do i have to structure a program.
It uses a simple structure, i mean everything in one file, but when the project became bigger i have seen differrent files saved h(c++ header) other C++(as source). Using VS, how do i uploaded these files, how do they work togheter? Where i can find documentation about that ?

Thank you very much.

You can simply use the #include "somefile.cpp" procedure.
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