How to apply a glass shader on my imported geometry? I'm new to Blender so I'm doing all my modelling in Maya and transfer to Blender using wavefront obj. I have create a simple wine glas, no texture applied, just geometry. I can apply color to it but when I increase the transmission value nothing happens.

Do I need to import my .mtl file? Tried to unwrap the UV's as well.
Assuming you are using the Eevee renderer. 

Go to Properties Editor > Render Properties tab and check Screen Space Reflections as well as Refraction. It brings a glass look to your material.

With Glass object selected go to Shader Editor > Properties panel N switch to Options tab and check Screen Space Refraction.
This enables other objects visible behind glass.