Seeking advice about Wordpress Themes

Hello everyone!
I don't know if it's the right thread to speaking about that, but here's the problem:

I wan't to achieve something like [this theme](https://themeforest.net/item/kraft-minimal-portfolio-wordpress-theme/19313943) for my personal portfolio.

I am a designer/artist and not a web developer, so I started exploring themes and how they works.
Is it hard to achieve something like the link I provided? Minimal, simple and with filtering categories kind of. I also found that it's called "isotope".

I am scared about buying a theme because I'll be relying on the developer for updates, and I don't want the website to break in the future.

I am also willing to learn new things and get my hands dirty on developing something similar. But I've found a lot of confusion about Website Editors, Elementor, Pro, Free, you name it! It's a complete jungle.

Thank's for everyone willing to help!

Cheers.