How it works
Sequence words make the order of several actions explicit.
我先吃饭，再复习，然后睡觉。
I eat first, then review, and then go to sleep.
Common mistake: 再 points to the next action here; 又 usually refers to repetition that has already happened.
Grammar pattern · HSK 3
先…再…然后…
先 + action， 再 + action， 然后 + action