Need help creating the design of a website.

Hello,

I am writing to you because I have some difficulties.

One of my clients wants me to create a website similar to this one in terms of design:

https://adrien-dubuisson.coach/

The problem is that I can't figure out how to do it. Besides, I'm not very good at English.

I can not put a background image that takes the full width of the screen.

I want to get the same layout.

Can you help me ? Do you have tutorials that could enlighten me?

Thank You!

Best regards,

Jerome