The word habit most often refers to a usual way of behaving or a tendency that someone has settled into, as in "good eating habits." in its oldest sense, however, habit meant "clothing" and had nothing. See examples of habit used in a sentence. A habit (or wont, the original word in english) is a routine of behavior that is repeated regularly and tends to occur subconsciously.
Expertise and habits of regular members are slowly revealed to other members of the community, and an implicit or explicit status is earned. Habit applies to a behavior or practice so ingrained that it is often done without conscious thought: Any action that you perform regularly as part of your routine can be called a habit.
Flossing your teeth would be considered a good habit. Sucking your thumb would be considered a bad habit, especially. Definition of habit noun from the oxford advanced learner's dictionary.
To fall/slip into the habit of doing something is to begin to do something in a regular way without realizing that you are doing it. It's easy to fall into the habit of not eating enough for breakfast. A habit is something that you do often or regularly.
He has an endearing habit of licking his lips when he's nervous. Many people add salt to their food out of habit, without even tasting it first.