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To create a bump effect, let's set up a Normal map.

Copy once again the texcoord and the tiledimage nodes. Load the normal map of your choice using the tiledimage node.

Create a normalmap node.

Connect the nodes and set the Node Type of the tiledimage node to vector3. The vector3 Node Type is used for reading normal maps.

If there is a discrepancy between the in and out node types of the connected output and input, the LookdevX Graph Editor pushes a warning.

Finally, connect a new tangent node to the tangent input of the normalmap. Set the normalmap Space to tangent.

Set the tangent node's Space to world. This is the default surface tangent vector.