Landsat imagaes

How to differentiate between Agricultural Land, Vegetation, Tree and Forest from Landsat Images?

SNAP S\W Has the capability to apply Unsupervised and Supervised Classifications, as well as calculations a lot of indices concerning vegetation and soil and water,

But since this is your first post, I’d suggest to you read the theory and the practical of Optical Remote sensing, the other thing is, Please use the search Function of the STEP FORUM to find a lot of topics related to your question, the third important thing, this Forum is allocated to post the problems related the processing and the software. For theory please read the help of the SNAP Also visit the RUS COPERNICUS they have a lot of tutorials and videos for people whom they have their first steps in Remote Sensing.