The steps for interferogram

plz i download two images from sentinel 1A , image before the inundation and the other after the catastrophe, but the images were in top sar , it means i can’t take subset from the 2 images
would you tell me haw many steps form download images to interferometry part
am i correlate the images and then take the specific area to studied it ?

please follow this tutorial:

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thank you this tutorial help me
are you have a other one for the results from time series to histogram, than i will try to start my project