What is the step of chess?

There is no guaranteed way to win a Chess game in five steps, it is possible but it requires your opponent to make very specific steps that leave him open in such a way that you can quickly take advantage of it.

That being said if you simply want to "end" a chess game in five steps (assuming your playing white)

1. Knight to C3

2. Pawn G3

3. Bishop to H3

4. Knight to D5

5. Very carefully and calmly place your finger on top of the King and tip him over (this is how you surrender in chess)

Note: steps 1-4 can be replaced by literally any legal moves that aren't surrender, and step five can be replace by "Very carelessly and un-calmly place your hands under the board/table and tip the whole thing"