'Used to' is used to talk about past habits or situations that are no longer true. Example: 'I used to live in Paris.' (but I don't live there now).
'Be used to' is used to talk about something that is familiar or normal for someone. It means 'to be accustomed to'. It refers to the present or future. Example: 'She is used to the cold weather.'
'Get used to' is used to talk about the process of becoming familiar with something or adapting to a new situation. Example: 'It took me a while to get used to the new software.'