Le Chatelier’s Principle states:
When a system at equilibrium is disturbed, the system shifts in the direction that reduces or opposes the disturbance.
In simple words:
STRESS → SYSTEM RESPONDS → NEW EQUILIBRIUM
Video 1: Introduction of Reversible reaction
Video 2: Le Chatelier's Principle (Part 1)
Video 2: Le Chatelier's Principle (Part 2)