Applicable for A-Level, IB, DSE, AP-Level Exams
Le Chaterlier's Principles states that if a system at equilibrium is disturbed, the equilibrium moves in the direction in the direction that tends to reduce the disturbance. Equilibrium will always shift to reduce the concentration when concentration is increased/towards the sides with fewer moles with increased pressure/shifting towards endothermic side when temperature is increased.
The Haber Process, methanol and ethanol production all utilise the concept of controlling equilibria.