Beginner here.

Question: What is the most common way to customize a WordPress site to a specific design?

Guys I've been learning html and css and have just started Javascript. But I'm wanting to create some WordPress sites for fun and so that I also have some stuff in my portfolio.

I'll be creating a portfolio site for af friend who's is a cinematographer.

I don't want to just use a theme but I'd rather create a fully customized website in conjunction with a set design, as I feel like this is what I need to know if I'm going to be getting paid for this in the future.

How does one go about doing this? I've seen many videos but they all seem a bit confusing. Maybe there's a video series that you could point me to.

I'm feeling extremely fucken lost.