Xna to Monogame

How it is simpler to transfer the XNA project to Monogame?
It is a lot of differences from XNA.

What exactly are you asking?

Exists the project on XNA. It is required to continue it in Monogame.
Simple transfer does not work: in Monogame there is no part of primitives, some used methods are strongly changed.

Does your project use XNA 3.0? In XNA 4.0 PrimitiveType.PointList does not exists https://blogs.msdn.microsoft.com/shawnhar/2010/03/22/point-sprites-in-xna-game-studio-4-0/.
Transfering a project from XNA 4 to MonoGame is usually easy.

Yes, 3.0. Old project.
It is necessary to rewrite.