1.HOW THE IMAGES ARE ARRANGE IN HTML (REAL PHOTOS)?

Answer 1

You will have to learn Css ( grid and/or flexbox )
Or you can use table.

Answer 2

Little note about asking questions on a forum:
Tags are a place to identify your question, its a good place to put the language you use.
Add details to make your question clear to others. Like how do you want to arrange the images.