To switch between them, press the key.
A 3D model looks grey and boring without materials. PBR (Physically Based Rendering) texturing makes your objects look real by defining how they interact with light. Blender 5 Complete Beginners Guide - FREE COURSE - Part 1 Blender Beginner-s Bootcamp
When you enter Edit Mode (Tab), you are dealing with three components: To switch between them, press the key