Belonging = attachment, connection, fellowship;  affinity for a place or situation.

• Our club holds occasional cultural programmes of the members in order to maintain a sense of belonging among the members.
• If you have a sense of belonging to the family, you will be prepared to sacrifice your personal comforts for the benefits of other members.

Belongings = the things that a person owns, especially those that can be carried;  possessions.

• He had some personal belongings in his bag when he went for the training.
• During the recent flood in Kerala , many people fled their homes leaving their personal belongings.