added a css file which has some files to style the site

Hello, I saw your HTML code, it is easy to understand, but I recommend that you use semantic HTML, with section, main, article tags, it will make your code easier to understand.

In the CSS styles of the image and the main div, you can give a max-width so that it has a max width. You can do it my friend, keep practicing

You have to use any Layout like Grid or Flexbox, to set the items like text or photo.