What did Ramanuja propound?

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Complete answer:
Ramanuja's guru was Yadava Prakasa, a scholar from the more ancient Advaita Vedanta monastic tradition. According to Sri Vaishnava tradition, Ramanuja disagreed with his guru and the non-dualistic Advaita Vedanta, and instead followed the scholars Nathamuni and Yamunacharya from the Tamil Alvars tradition.

Ramanuja is famous as the chief proponent of the Vishishtadvaita subschool of Vedanta, and his disciples are thought to be the writers of texts like the Shatyayaniya Upanishad. Ramanuja wrote influential Sanskrit texts such as bhasya on the Brahma Sutras and the Bhagavad Gita.

He propounded the doctrine of Vishishtadvaita, or qualified oneness, in which the soul remained distinct even when united with the Supreme God.

Ramanuja emphasised the epistemic and soteriological significance of bhakti, or personal God devotion, as a path to spiritual liberation. His theories claim that there is a plurality and differentiation between Atman (soul) and Brahman, while also claiming that all souls are one and that each soul has the ability to realise identity with the Brahman.

Note: Ramanuja's mummified body is preserved in Srirangam's Ranganathaswamy Temple with sandalwood paste and saffron. A temple and an active Vishishtadvaita school are situated near Ramanuja's birthplace near Chennai. Chinna Jeeyar's Equality Statue in Hyderabad is dedicated to Ramanuja.