I often come across problems that involve deleting both rows and columns in matrix in order to create some special matrix. One example I noticed today is the problem Coin Grid from the CSES problem set (link). I couldn't find an editorial for the task, and I never knew how to approach such problems, even thought I have seen couple of them. Can you give me some general hints and advices on how to approach such problems, when you need to find minimum moves and you can modify both rows and columns at the same time.

I couldn't find the older problems I have seen, but if you know some, please share them in the comments.