This website has lots of useful pieces of advice on being a salesperson and life in general. It is based on my experiences with people. It has information on why people do what they do, how to recognize and handle certain types of situations, and suggestions on how to conduct yourself.
If you are new to sales, embedded in business life and want to understand more about it; if you thirst for how to make yourself better, this website could be useful to you. Much of the content can be applied to life in general. This is the type of thing I wish I had when I started out in sales years ago. Hopefully, it can motivate and encourage your growth.