Tram is the best way of getting about - fast, frequent and cheap. Buy tickets from kiosks(Ruch)or some hotels.You used to get 11 for the price of 10 - I don't know if you still do. Buses use different tickets - a bit more expensive I believe.
But Poznan is one of my favourite cities and I go back every year - don't forget the steam hauled trains to Wolsztyn! 
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