Once upon a time, a retailer could place an ad in the Yellow Pages, slap a logo and phone number on a billboard, and call it a marketing plan. Today, new marketing opportunities abound. Here are some trending marketing practices that might be worth adopting to give your business a boost.

1. Mobile first. The number of web searches done on mobile devices is at least 50% and growing, according to Google. Optimize websites and other digital content to be viewed on mobile...