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{ctrl+shift+enter} is used when you have a formula involving array to process several values instead of one. An array formula can be utilized to perform various different types of computations depending upon your requirement.
To give you a small example:
The TRANSPOSE function uses array. So if you just type = TRANSPOSE(range) e.g. =TRANSPOSE(B1:B5) you will get an error #VALUE!, because in this case, the cells are working independently and so the function doesn't make sense to each individual cell. In such case you would use {ctrl+shift+enter} to identify the formula as an array formula and get the desired outcome. As previously mentioned scenarios can be many.
Dear Mr. Ahmed
It is depend on your work, the problem that your a trying to solve.