A community garden is a place often in a park or on public land where people can grow food together. Typically the garden is divided into plots and each gardener is assigned their own plot. Gardeners are responsible for taking care of their own plot and are able to make their own decisions about what to grow. Usually there is some number of workdays that gardeners are required to attend. Generally there is an annual charge for the plot but many gardens offer a sliding scale for fees.
Like its name suggests, a community garden offers gardeners the chance to grow in collaboration with other people. Experienced gardeners can share their knowledge with new gardeners. Many gardens plan potlucks together or offer other opportunities to gather. It can be a rewarding experience.
These RI organizations keep online lists of community gardens so you can learn what is available in your neighborhood and find out who to contact:
Southside Community Land Trust (SCLT): https://www.southsideclt.org/community-gardens/ (gardens listed for Providence, Pawtucket and Central Falls)
Farm Fresh Rhode Island (FFRI): https://guide.farmfreshri.org/food/communitygardens.php?zip=02906 (gardens listed for Rhode Island and nearby Massachusetts)
Garden Time can assist with this search. (link to GT)