Before you start with Spring it is a must have that you understand what Spring beans are. In my opinion this is explained in a too complicated way in most resources out there. I really aim to make it as simple as possible.

In short:
Spring bean: an instance of a class managed by the Spring Container
Spring (IoC) Container: the core part of Spring that is responsible for managing all the beans

In this video I will explain that (after a general introduction to Spring) and I will show you a code demo to show you how and what Spring beans get instantiated.