Conversation so far:
What was Swami Vivekananda's philosophy?
Modern Vedanta, Rāja yoga
How did Swami Vivekananda go about teaching his philosophy?
His teachings and philosophy stressed on different aspects of religion, youth, education, faith, character building as well as social issues pertaining to India.“
Who were Swami Vivekananda's followers?
Vivekananda attracted followers and admirers in the US and Europe
What else can you tell me about Swami Vivekananda's teachings?
Vivekananda adapted traditional Hindu ideas and religiosity to suit the needs and understandings of his western audiences, who were especially attracted by and familiar with western esoteric traditions and movements.

Question: What did he teach about human development?
Self-contained rewrite: What did Swami Vivekananda teach about human development?