Final answer:
To add a Principled BSDF in Blender, select the object, switch to the Shading workspace, press Shift + A in the node editor, add the Principled BSDF shader, and connect it to the Material Output node.
Step-by-step explanation:
Adding a Principled BSDF shader in Blender is a straightforward task. Start by opening your project and selecting the object you want to apply the shader to. Then, switch to the Shading workspace from the top of the Blender interface to access the node editor.In the node editor, you'll typically see the material nodes for your selected object. If a Principled BSDF shader is not already in use, you can add one by pressing Shift + A to open the Add menu. Navigate to Shader and then click on Principled BSDF to add it to the node editor.
Once the Principled BSDF shader node is added, you can connect it to the Material Output node by dragging from the BSDF output to the Surface input. Now you can adjust the various properties of the Principled BSDF shader like Roughness, Metallic, Specular, and more to get the desired material look for your object.