S1 S2 S3 R1 R2 R3 in Trading: A Trader's Complete Guide

Confused by S1, S2, S3, R1, R2, R3 in trading? This definitive guide explains what these pivot point levels are, how to calculate them correctly, and how professional traders use them to find high-probability entries and exits.
What is S1, S2, S3, R1, R2, R3 in trading?