Not too long ago, I enrolled into CGMA's class Hair Creation for Games (https://www.cgmasteracademy.com/courses/48-hair-creation-for-games) taught by Johan Lithvall. The class was great, and I learned a lot in terms of having a very linear, easy to understand and methodic workflow for game hair.
This is the Final asset I made during the class, it is 28.000 tris with a 4kx2k texture and is rendered with Unreal Engine.
The hair cards are made with Xgen, Baked in Xnormal and then placed in Maya.
it was quite something getting your mind wrapped around doing hair like this, but I am glad it turned out like it did.
This was feautered on 80 level in an interview article where I talk a bit more about the process, give some tips and tricks and a bit about the course.
by now quite a few people have used my article as reference to help them make their own hair, and it makes me so happy that people can use it.
You can check out the article over here https://80.lv/articles/004adk-005cg-cgma-student-project-voluminous-hair/