why to copy and copy paste a file html

Question

copy and copy paste

Answer 1

Here's an interesting text about copy and paste codes:
https://blog.codinghorror.com/a-modest-proposal-for-the-copy-and-paste-school-of-code-reuse/

Answer 2

sometimes it makes things easier . you can copy a part of html of any web page and experiment with it locally i think ... Try to understand what the tags are doing etc. if you just started dont try complicated pages find simple pages like blogs maybe or some forums perhaps