How can i add color to just one line / word / letter?

[SableRojo000]

That's my question, how can i add color to just one line / word / letter?
Info:
win 10
Dev c++ 5.11

[George P]

http://www.cplusplus.com/articles/Eyhv0pDG/

[SableRojo000]

But how can i add that to my code

[George P]

https://www.learncpp.com/cpp-tutorial/header-files/