There is an easy to remember SAP Tables.
You have just to understand the terminology of SAP naming the business objects.

Remember Sap Tables Starting with:

L*-> Vendor Tables ( LFA1 , … )
K* -> Customer Tables ( KNA1 , … )
V* -> Sales Tables ( VBAK , … )
T* -> Master Data Tables ( T001 , … )
B* -> Banking Tables ( BKNF , … )
E* -> Purchase Tables ( EKPO , … )
M* -> Material Tables ( MARA , … )

SAP Tables Header/Items

Table name contains
*K* -> Header Table ( VBAK , EKKO , … )
*P* -> Item Table ( VBAP , EKPO , … )

SAP FI Tables

Tables name contains:
*I* -> GL Open Item ( BSIS , … )
*A* -> GL Closes Item ( BSAS , … )
*S* -> GL Account

Or if Tables name ends with
*D -> Customer Related
*K -> Vendor Related
*T -> Text SAP Tables?

Original post can be found here