There are so many ways you can do A/B testing, but in the end, you're just looking for the best ad or landing page in order to convert more people while paying less money. You can A/B test ads, banners, landing pages, ...
When you start an advertising campaign, especially when on a PPC platform like Adwords or BingAds, you'll need to do plenty of split testing to be sure what works and what doesn't. Sure, you could hit a home run right ...