How to make a fantasy map like Dota2 / League of Legends


I am very knew to Blender and I have been learning the basics. I am sorry if this is a very vague question.

I know part of dota2 / LoL maps are based on the texture styling but I am very interested in knowing if there are any tutorials related to this type of low polygon modeling ( I believe is low polygon? ). Most tutorials I find are all about realism and that’s what I don’t intend to do. I want to create a more “cartoonish” style elements very similar to those Mobas or even something like the Endless Legend map. Please check the screens below to see what I mean.

Thank you in advance.

Endless legend -

Dota2 -

LoL -