Hi,
User generated content need to be stored under "/content/usergenerated/content" and you can create necessary folders as per the project requirement.
Below links provides details on UGC services/configurations needed
https://docs.adobe.com/content/help/en/experience-manager-64/communities/administer/user-ugc-managem...
http://aempodcast.com/2016/aem-resources/aem-ugc-practical-example/#.Xh9L9kVKjxU