Hello guys!
I am using the stiletto theme. https://www.thenueco.com/products/debloatplus is the shop i have as an inspiration.
I like the three column layout of the product page. How can I achieve this kind of layout in my theme?
I hope someone can help me.
Best regards 
EDIT: Sorry, misunderstood the question.
The Stiletto theme doesn’t have a 3-column layout like the one you linked to, built into it.
See here: https://help.fluorescent.co/v/stiletto/product-pages/product-template
You’d definitely need to hire a custom coder to edit the theme to support a 3 column layout like the site you linked to.
https://www.shopify.com/partners/directory/services/store-setup/customize-theme