A/B testing turns website guesses into measurable conversion gains by letting visitors reveal which page version works. Saleh explains how a page with 10,000 visitors can split traffic 5,000 and 5,000 to compare outcomes. Instead of trusting opinions, teams test headlines, images, social proof, layouts, and buttons against a clear action. He warns that best practices can lose, including a category-page Add to Cart removal that cut sales 15%. The better path is to start small, get wins of 10%, 15%, or 20%, then expand testing ambition. FigPii also combines session replays and onsite polling to show clicks, scrolling, exits, and objections. The takeaway is to define one page goal and keep asking what you are testing this month.