Hello, I have this question:
I have a plane with base color green (grass imitation). Now, I want to paint a brown path through the plain, possibly with option to easily edit it, like using weight map. How is this achievable? I would search Google but it’s my first week with Blender and I don’t even know how to call this action of painting a color over a color on the same mesh.
Sincerely,
Pralky
Depends on the used render engine and its material system. Could paint a greyscale mask and use that to mix two colors, two textures, or even two materials.
very old tutorial but shows one example of that https://cgmasters.net/free-tutorials/splatting-library-linking-in-2-5/
Also, if you do edit or create new image in Blender, remember to save that image separately on the disk since it doesn’t save with the .blend.
Yes, my bad for I did not specify the render I use. It’s Cycles, which has no option like such. But still thank you for showing me this method. 
So, how about Cycles engine way to do that?