Videos
Following is a list of SAP Videos which will definitely help you.
In all probability you should be able to see the videos. If not check whether you see a video on site like – youtube.com . You may be accessing internet from a restricted environment like your company or college.
What is SAP?
Evolution of the SAP Product Suite.. Details on Netweaver and mySAP
What is an Infotype
How to Modify an Infotype