Entire books have been written about the importance of a good handshake. Whether or not any of the analysis on what different kinds of handshakes mean is true, what is important is that many people believe a handshake can tell a lot about a person. The best handshakes are firm without being crushing, brief but not terse, and of course, free from nervous sweat. To create a good first impression, ensuring you have a good handshake could be crucial.