copying entire web pages

Hello, I am looking for a script that will allow me to copy the entire website of my choice, for example a store with offers, so that I can edit it when I save it. I need to do this in order to check the market in a given niche so that customers seeing the page I am editing and entering their data can ask and send all inquiries to my data to my phone number and to my e-mail address. for this purpose, I need to download websites and stores or blogs of my choice and transform them for the purpose of analyzing the market and researching a given niche.