Habits occupy a very large part of our lives. Its good if your habits help you, but if your habits harm you, then it makes life very difficult. Therefore, it is important to have as many good habits as possible and get rid of bad ones.
You cannot describe bad and good habits.
For some people some habits are bad and some are good - everything depends on the kind of person that has this habit.
If you feel that you have a bad habit you can quit it by leaving it out of your daily routine. If you do it one, two days without this habit then you are nearly quitting it.