Themes

https://www.orthodouches.ita.agep1989.ch

Hi, i want to handle my theme (colorway) or better my home page, like a normal page, and change it how I prefer , like inserting a contact form , more photos, free text, and other things, like secondary pages. Can I do this ??

Please explain me how I can do it , or if it is possible.
Really thank you,
Have a good day