SAP (= Systems, Applications, and Products) produces powerful software (see the list of SAP Modules), mainly designed to control, organize and administer huge companies. Its ever increasing capability goes hand in hand with an even further tangled internal structure. An overview of the most important SAP Tables (sorted by category), as well as a list of the necessary SAP Transaction Codes to maintain them, is provided.
The implementation of SAP is usually a big project and not without risk. The SAP software, although being standard software which offers ready to use business processes, is very adaptable and it takes consultants a long time to figure out what the client really wants & needs (and these are two different topics!) and then also to figure out how to adapt the software itself. So IT projects frequently run out of budget, scope and time or all of them. There is however, a very intriguing and advanced list of lessons learned from decades of project management — which not too many project team members from the IT departments seems to have read.
And if you face problems using your software or hardware and reading the manual was not helpful, because it was cluttered with gobbledygook and the experts tried their best to make it completely nonsensical to outsiders by using technical jargon — have a look into the section for Internet related abbreviations & acronyms. Maybe it helps.