How do I copy the codes into my computer to run them?

Hello. I just reading about C++. But I now found codes I would love to run. How do I copy and paste these codes to my computer to run them? Is it in the codes area that they will be pasted? Do I need to save it afterwards? How to I run it? If I download the free codes, please how do I copy the codes? Do I need to download any other program to be able to run the free c++ codes? Where can I get beginers tutorial on c++? Where can one download free c++ authentic software? If I write programs for other people, should they have c++ to be able to run the programs?
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