Both must and have to talk about rules or regulation, restriction. Must is used when you give your opinion, for example: You must go to bed early, working late at night is not good for your heath. Must is also used in written laws as in examinations: You must write your answers in ink or applications for the job must be receive by 20 November.
Have to, on the other hand, is used when something is necessary to do or obliged to do. For example: I have to work at the office from 9:00 am to 6:00 pm with a hour break.
Must not and do not/ does not have to are quite different. If someone must not do something it means he or she is not allowed to do it, it is restricted. For example: This data is personal. Facebook must not submit it to someone else. On the other hand, if someone does not have to do something it means they do not need to do it, but they can do if they want. For example: These exercises are optional, you don't have to do them.
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