In strategic thinking (Sun Tzu, Clausewitz, or even modern business warfare), gates represent:
Strategic prayer, military-style intercession, and spiritual warfare to impact local churches and nations.
The phrase "conquistando todas las puertas del enemigo" appears to be a variation of the title of the influential book Conquistemos las puertas del enemigo (English title: Possessing the Gates of the Enemy Cindy Jacobs Amazon.com