There are 4 Table-Types within the SAP System:
The most important SAP tables (functional and technical), including:
TIP: Via the SAP data model, (using transaction code SE11), the SAP table structure (list of table fields) can be viewed.
ABAP & SAP Data Dictionary Tables
ALV (ABAP List Viewer) Layouts / Table Controls
Enterprise structure / SAP FI Basis Customizing
General Ledger (=G/L) accounts
Text / Print / Spool / SAP Documentation
User Administration / Authorizations
SAP-FI: Accounting documents (postings)
SAP-CO: Controlling / Cost center
NOTE: The usual SAP terminology Create, Read, Update and Delete (CRUD) is abbreviated here and referred to as change or maintain.