Learn Swedish: På morgonen dricker hon kaffet. - In the morning she drinks the coffee.

This is because of the V2 (verb-second) rule. In Swedish, the verb must be the second block of information in a sentence. Since this sentence starts with the time phrase På morgonen in the first position, the verb dricker has to come next. This pushes the subject hon into the third spot.

Why do we use På here? Doesn't på usually mean 'on'?

Yes, på often translates to 'on', but Swedish uses it for specific time expressions where English uses 'in'. To say 'in the morning', you always say på morgonen.

Why does morgonen end in -n but kaffet ends in -t when both mean 'the'?

This is because Swedish has two noun groups. Morgon is an en-word, so you add -en to the end to say 'the morning'. Kaffe is an ett-word, so it takes a -t at the end to become kaffet (the coffee).

Does På morgonen refer to a specific morning, or just mornings in general?

It can mean both! In Swedish, you use the definite form for times of day like morgonen (the morning) or kvällen (the evening) to talk about general routines, exactly like we say 'in the morning' in English.