“a hundred days of sermonizing, one fart” → a metaphor for how something that one has put great effort into can come to nothing after even a slight mistake, much as a hundred days of serious spiritual study can be lost to the winds

mimic, imitate / guess, suspect / pseudo-, mock-

technique, art, craft, performance / Short for 安芸国 (Aki no kuni, “Aki Province”).

fan

zero / nought

(literally) plan your day during the morning, plan your year during New Year's / early planning is the key to success

a female given name

cool / cold (beer, person) / chill