You use maybe to express uncertainty, for example when you do not know that something is definitely true, or when you are mentioning something that may possibly happen in the future in the way you describe.
You use maybe when you are making suggestions or giving advice. Maybe is also used to introduce polite requests.
You use maybe to indicate that, although a comment is partly true, there is also another point of view that should be considered.
You can say maybe as a response to a question or remark, when you do not want to agree or disagree.
You use maybe when you are making a rough guess at a number, quantity, or value, rather than stating it exactly.
People use maybe to mean 'sometimes', particularly in a series of general statements about what someone does, or about something that regularly happens.