How do I apply a texture to only 1 face? Since Blender 2.8 I cannot seem to texture only 1 face. I have done this before in Blender 2.79, but now it seems to have changed completely. Is this still possible in Blender 2.8, or do I have to switch to Texture Painting?
I don't know how it worked in Blender 2.79. But if you want to add texture to a single face you have to go to Edit-Mode and then mark your face. Create a new material and klick on assign. (The Materials Pannel in 2.8 is on the right side of your Viewport.)

Now you should only have the marked face painted, you are able to add textures by pressing: Use Nodes (also in the Material Panel).

I hope my description works for you, if not let me know. 

Greetings Sebbe