What UX design patterns are suited for displaying a catalog online?

Since many years we are using a product catalog (print) with many products in it, but since it costs a lot of money to print and send it to our customers, we slowly want to move from a physical catalog to a digital one.

There are many PDF e-publishing tools, but it feels like it doesn't really work with a 500 page catalog. Since there is no traditional flat/deep hierarchy, like a usual webshop has.

There are some examples like IKEA (where you can browse through pages online, download a pdf version or navigate to specific chapters): https://onlinecatalogue.ikea.com/PT/en/IKEA_Catalogue/#/pages/1

What are some UX design patterns that are suited to displaying such a big digital catalog?

Hopefully anyone of you can help me with his/her experience on this subject.

Many thanks in advance!