a/an: when we say what something is or what somebody does,  the first time we mention a thing / person, in exclamations with What..!, in expressions of frequency like twice, once (+ periods of time like day, week, year, etc.), the: when we talk about something we’ve already mentioned, when it’s clear what we’re referring to, when there’s only one of something, with superlatives, with places in a town, e.g. cinema, theatre, bank, gym, (no article): when we are speaking in general (with plural and uncountable nouns), with some nouns, e.g. home, work, school, church, after at / to / from, before meals, days, and months, before next / last + day, week, etc.,

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