Spring has many sub- projects and 2 days is not a reasonable amount of time to even scratch the surface. It is one of those things you are going to have to learn as you go once you get your small assignments. You can get acquainted with the various spring projects here:
http://www.springsource.org/projects
I would start with core spring see here:
http://www.springsource.org/spring-framework
On that same link you will find the reference documentation which is very good and also a link to the spring-samples repository. After that google around for 'Spring tutorials' and try to make sure the tutorials are current and are using at least Spring 3.