Direct reatiners (clasp assembly) include rest, retentive arm and reciprocal arm.
In this video we will see in detail about Rests and Rest seats (prepared surface in teeth which holds the rests)

To know about Kennedy's classification
   • KENNEDY'S CLASSIFICATION | RPD | PROS...  

To know about Parts of RPD
   • RPD | PARTS OF REMOVABLE PARTIAL DENT...  

To know about Maxillary major connectors
   • RPD - MAXILLARY MAJOR CONNECTORS - Pr...