The six canonical collections are Sahih al-Bukhari, Sahih Muslim, Sunan Abi Dawud, Jami at-Tirmidhi, Sunan an-Nasa'i, and Sunan Ibn Majah. Bukhari and Muslim are regarded as the most authentic after the Quran.
References
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Informational, not a personal fatwa. Consult a qualified scholar for rulings on your situation.