How can i use puts() ,gets() , and other string functions ?

Question

I am learning C++ in Geany compiler..
I Geany <cstdio> header file is used for string functions like puts() ,gets()..
And i didn't know which header file is used in Sololearn..
Be cause i didn't opened that lesson...

And i want to know all header files in Sololearn...
If you can please list it....

Answer 1

https://en.cppreference.com/w/cpp/header