Texture on model

Hello! I have a few models that when I add the texture it applies it as one whole solid color unless I do it the right way with certain colors in certain places so it looks nice.

Id like to know where to do the colors and how it would look like applied, so I did a test material and I’m very confused, because I thought I did the material correctly but it still has issues:

As you can see there are patches of “sand” color where there should only be “grass” color.
here is the texture source:
Screenshot 2022-11-30 2.11.54 AM
If you know how to solve this please let me know as soon as possible.
Thank you for your time.