I downloaded STS and tried to import the Maven projects but I don't know what to do next.
Can anyone please help me?
It's very frustrating that I'm trying to learn Spring and I'm expected to first learn something that is not essential to Spring itself.
I have found that many projects have switched to Maven for builds and you need Maven knowledge to build and run the example apps. So it is worthwhile to learn something about Maven; a good place to start would be Better Builds with Maven (http://www.maestrodev.com/support/) - it's a little dated but it does explain the concepts behind Maven and then walks you through two tutorials (one a regular Java app, one a web app) that will help you gain a good understanding of Maven. And it doesn't take all that long - I think I went through it in about 1/2 day.