It’s hard to believe, but just a few short years ago, we knew next to nothing about inbound marketing. What we did know, however, was that marketing was changing. Methods that had worked for decades were no longer effective. The marketplace had changed. The way people did business had changed. The more we learned about inbound marketing, the more sense it made. So we changed too. Shifting to an inbound approach has had a dramatic impact on our business—and on the businesses of a number of out clients. And you know what? We’re still learning—and changing. I recently thought about some of what we’ve learned over the last three years. Here are three of the most significant lessons we’ve learned.