What are the teachings of Muhammad mainly found in?

Answer 1

The are mainly found in the holy Qur'an, the last book revealed to Hazrat Muhammad (SAW) by Almighty Allah (God). His own teachings are found in the collections of his sayings (called Hadith).

Answer 2

The answer you are looking for is the QUR'AN, but most Muslims would disagree with this answer based on the phrasing of the question. According to Muslims, Muhammad received the Qur'an directly from God, so the words of the Qur'an are not Muhammad's teachings, but rather God's teachings with Muhammad being little more than a vessel for God's message.

As for what Muhammad himself is supposed to have taught without direct Divine Guidance, there are numerous Hadiths as well as Sirat an-Nabi (The Biography of the Prophet) where Muhammad gives many direct commands and philosophical edicts. Those would be more clearly and unambiguously the teachings of Muhammad.