The Secret of Networking in One Diagram
Luckily there is a simple Venn diagram that helps understand these concepts in just a few minutes, or even seconds.
First of all let's assume that you are in the typical position of being able to do something and you would like other people to ask you to do that thing. One trivial way to approach this would be to get to know many people, but that will not help you very much. Knowing other people means that you could, in theory, keep calling them to ask if they need you. Most of the time the answer is no. It also means that you are not considered in the common case when someone asks one of your connections if they know someone like you.
What works much better is to make sure so that more people know who you are, that they trust you and that they know what you do. Then they will think of you when they have a need or they hear of someone else with that need. We can explain this logic with my simple Venn diagram.