For background, I'm a UI product designer – but I have built a few things using no code sites and used to do a bit of .css.
I really like this e-commerce site and I'm trying to figure out how to plan a build for something of my own. Even if I need third party help to support.
I’ve managed to deduce from ‘built with’ that it’s using salient on the theme side of things and woo commerce – but from researching the many option I’ve no clue what page builder to put these together with.
I’m getting a bit lost with all convoluted subscription options from woo commerce, elementor and even WordPress.com. So – I’m really curious how they put this humpty together.
So any help/advice on how to begin a site like this would be must appreciated or whether a 100% custom built design system would be a better approach in the long run. (Apologies in advance if this post full of dumb repetitive questions).

So basically you want to build an ecommerce site. That’s fine.
You can use WooCommerce to do it on a self-hosted WordPress.org installation. The process can be long but if you follow the steps to [create an online store](https://www.wpbeginner.com/wp-tutorials/how-to-start-an-online-store/), you can get it done easily.