Import map tiles?

Hi guys, they all look promising but I’m not sure how to use them… I’m not a developer… I only know how to use a vl nuget package with examples !
Moreover, I realized that I might express my self badly. What I really want to acheive is a 3D topographic map in a really minimal graphic style, something like this :

image

A colleague has suggested me to import style from osm or mapbox, that’s why the subject of this post. But now I wonder if there are other ways ?

fyi, this is an alternative visual on this same map project