How do I model this correctly? (beginner)

AntBay

I am currently 3D modelling a shape and my brain can't find the correct way to model the curve highlighted with red on the image. The green line is where I want a sharp edge if that makes any difference. 
I appreciate any tips!

Sorry for the noob question.

FrankPolygon

@AntBay Welcome to Polycount. Consider checking out the forum information and introduction thread.

The technical talk section has a pinned thread dedicated to modeling and topology questions so I've answered your question there: https://polycount.com/discussion/comment/2745115/#Comment_2745115