Things that nullify wudhu

Assalamu Alaikum, Respected Sheikh, I want to know many ways are there which nullify wuzu. Some one told me 8 ways. But I have heard 20 ways. Got confused.In which book will I find all the ways and methods of wuzu, namaz, faraiz of namaz, faraiz of gusul, nullifiying of wuzu, namaz e janaza etc Please help.

Jazzak Allah!

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