Upanishad Told by Rama to Hanuman / Importance

1. https://m8nk.blogspot.com/search/label/Muktika
2. https://ramayanainfo.blogspot.com/search/label/RamaRahasyaUpanishad

A large number of Upani¬ads (approximately 1180) have been recognized in the Vedas.
Of these, 108 were considered key Upanishads as these were given to Hanuman by Rama.
http://vedantaupanishad.blogspot.com/