Learn Turkish: Burada dur.

To give a direct command to one person (the informal 'you'), you just use the bare verb root. By dropping the -mak from durmak (to stop), you are left with the command dur (stop!).

Why is there a -da at the end of burada?

Bura means 'this place.' The -da is the locative suffix, which means 'in,' 'on,' or 'at.' So, burada literally translates to 'at this place,' which is how you say 'here' in Turkish.

Could I say buraya dur instead?

No, you must use burada (at this place) because stopping is an action that happens in a fixed location, not a movement towards it. You would use buraya (to this place) with verbs of motion, like buraya gel (come here).

Is it rude to just say dur?

It is very direct! Using the bare verb root is the informal way to give commands, used with friends, family, children, or in urgent situations. To be formal or polite to a stranger, you would add a suffix to make it durun instead.