Many people exist on the surface. By this I mean they know a little about a lot, but not the opposite. This can create a short conversation, but no chance to really learn more on a subject. The more knowledge you have on a subject, the better chance for you to be viewed as an expert and someone people look to.
Whatever you do for a living, people are looking for your expertise. All day everyday, people are looking for help from people who have gone deep and know what it takes to get the job done. People don’t hire me to assist on their legal matters because I’m a nice guy and friendly (though these things are helpful in the big picture), but because, when we meet or speak, it’s apparent I have the experience and knowledge to help them. If I can talk the talk, but not walk the walk, it will become obvious soon enough, and only lead to problems for me and my client.
This applies to you whether you are in sales, an attorney, an auto mechanic, or something else. By going deep in areas important to your work you’re investing in yourself. This is the type of investment that pays off, makes you a person of substance, and allows you to move forward in your chosen line of work with the best opportunity for success.