This is a beginner-friendly tutorial that will show you the basics of texturing in blender. We'll be using the free software gimp, and then bringing our texture into blender. The techniques used in the video will also work with other image manipulation programs such as photoshop.
If you enjoy the video, drop a like so that others may see it as well.
Thanks and have a good one!
Resources:
https://www.blender.org/download/
https://www.gimp.org/downloads/