how can i make good texture

idk how to make texture / materiel for my game rn am just using a plane color with no details is there any way to make them look stylized or an easy app to make texture for my landscape / rocks /trees

Here is a tutorial for how you can make stylized tree texture:

thx do u know anything bout the ground texture its the most important

Simple landscape texture that shows you how you can blend different textures to make one material:
Create A Simple Landscape In Unreal Engine 5 (youtube.com)

Here is a more complex landscape with 3D grass:
Stylized Grass Tutorial (youtube.com) If you don’t have Maya, you can use Blender or your preferred 3D software to make the grass mesh.