Procedure for Thresholding in Sentinel-1 Images

I’m a beginner at SAR image processing. Can anyone enlist the steps involved in Thresholding. In my case, I want to delineate water and water-like radar responses.

Here you have an easy tutorial for what you’re asking for :
And here’re the instructions step-by-step :

Also, if you’re really new, I suggest you follow the entire course. The beginning is a bit slow but it becomes really interesting for newbies from chapter 2 :

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Thank you for the links.