N4
あとで
After, Later
仕事の後で、飲み会に行きます。
I'll go to the drinking party after work.
Explanation
「あとで」 puts two things in order: the first is finished, and then the second happens.
With a verb, use the 「た」-form: 「食事をしたあとで、散歩に行きます」 (I'll take a walk after eating). With a noun, add 「の」: 「授業のあとで」. On its own, 「あとで」 means 'later'.
Mixed up with
「~たあとで」 only gives the order; there can be a gap between the two things. 「~てから」 is tighter and can also mean 'ever since': 「日本に来てから、ずっと一人暮らしだ」.
Even for the future, the first verb stays in the 「た」-form: 「明日、映画を見たあとで食事しよう」, not 「×見るあとで」.
「~まえに」 is the opposite and takes the dictionary form.