What files to target if someone wants to change the main/front page?

Hello everyone,

 

I searched a lot about this but couldn't get any solid info on it. Can anyone help me identify the files and their location for changing the main/index page of the site?

Actually I just want to add a custom main/index page in stead of the regular login page and would like to know which files to target to change only the index page but my core (logged in pages) stays the same.

 

Please keep in mind that I am php virgin and would only understand simple english. Thank you very much for your help!

Beginning Developers

Beginning Developers

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