We have started working with sitefinity and we are facing a problem while working with "CRUD" Operation in database.We are unable to get any details of it i.e.

how to create custom table in the sitefinity database  and perform (insert , edit,delete ) operation on it. for e.g. if we would like to insert  user details in a  table , editing

user details, deleting user details etc. 

where can we get reference for doing CRUD operation or is there any documentation available 

Could it be possible to share such details with us, so that we can  make progress in it.

Thanking you.