Chipp Walters shows how to add decals to objects in Blender Eevee.
Adding decals or labels to objects in 3D for rendering is different for every renderer. If you are trying to create decals for real-time shading like with Eevee viewport renderer, the process might even be different still. Check out this short tutorial from Chip Walters that shows how you can easily add decals to objects for Blender Eevee.
Walters uses his definitely EEVEE Materials System which is a systematized approach to applying over 100 curated and popular materials to create photorealistic scenes and objects in Blender 2.8. The material collection offers 100+ EEVEE compatible photo-real Materials which can be added to any object using the included FREE version of KIT OPS.