I want to create DSM from Sentinel 1. please give me the tutorial
To achieve this, some theoretical and technical knowledge is required, otherwise you won’t be able to search for suitable data, estimate their potentials/limitations and to estimate the quality which can be expected. I can recommend these documents compiled by ESA:
InSAR processing: A practical approach
Once you have these basics, a nice example of the single steps is given here:
You’ll find many other topics on that in the forum.