They mean making sure each step is the same height above the previous. Like if your first step is 7” high, then all steps should be 7”. Not a 7” step, then a 10” step, then a 5” step, etc.

There’s some math involved to figure out the riser height given a certain distance from the upper landing, and it all depends on how much space you have, what code says for a landing, what the minimum tread depth can be, etc.