Where can I find good literature for beginners? I am trying to find some database tutorials,books and similar, since I have started this course in college, and received some material, but it is really hard to manage through all the info on the net. I searched through the questions on the site but didn't find any. Thankfull for all your input.
It sounds like you are looking for something on an overview level rather than a practical level.  If you are interested in learning about Oracle databases from a practical level, there is no better place to start than the Oracle Concepts Guide.