How should I study for the certification exam? (Good person.) What questions are on the exam? (Cheater.) I'll address these in a future blog. Ravi Sankar Venna addressed this recently in his blog, How to Approach and Pass a SAP Certification.
However, I am in favor of educating yourself in order to make better career decisions. In this blog series, I'm going to cover ways to become educated and I'll try to start with the free approaches and gradually move to the more expensive approaches. Due to the length, I've had to split this post into several posts.This blog will only cover web sites.
There are a million web sites that talk about SAP. The problem is that it is difficult to find a simple introduction for folks who have absolutely no knowledge of SAP and it is difficult to get an orderly introduction where one concept builds on the next (classes are better for that). Obviously the following is not a complete list, but I'll try to list out a few of the most popular. I will be happy to update this list if folks have favorite websites and you leave them in the comments.
Best general overview of ECC modules I've been able to find
There are quicklinks that lead to in depth topic areas. These are my go-to source when I want in-depth, official information presented in an easy-to-digest package. (There are often presentations at the quicklink areas as opposed to reading the help.)
https://service.sap.com/notes - Place to search for information that may be newer/changed from the previously published information. Also the place to go when you think the software is not functioning properly.
https://service.sap.com/erp - great place to start for anything having to do with SAP ERP. There are subsections here for all of the basic modules.
https://service.sap.com/bmet - SAP Business Maps can be used to get a visual overview of SAP functionality. They're broken down into industry maps, cross-industry maps, and Netweaver maps. Unless your primary interest is a specific industry, like Retail, I recommend starting with the Cross-Industry maps. The Netweaver maps are of most interest to Basis folks, programmers, and Project Managers.
http://www.linkedin.com/ - I personally find that the SAP forums that I've seen on Linked In have an annoyingly small signal to noise ratio (more noise than signal), but I do follow the education forum. If you have a forum you've found helpful, please link it in the comments.
https://twitter.com/ - Twitter. I'm fairly new to twitter but reliable sources tell me that if you follow the #SAP hashtag, you'll get great tidbits and news items of interest to folks in the SAP world. I can be found/followed on twitter @thomas_dulaney
Hopefully this is enough to get you started. Please link your favorite sites in the comments!