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Most of the ABAPer or who ever use SAP at some point stuck at the point to know or remember Transaction codes.
The following list displays the set of useful T-Codes for SAP System Administrator. These are T-Codes used by Basis Team on regular day-to-day basis.
(Any additional T-Codes are welcome 
Assigning a T-Code to an ABAP Query can be done in two ways. By first method, you assign Query Program Name to the T-Code. In second, you assign the Query directly to the T-Code.
It is recommended not to assign Query program name directly to trnasaction code in case of queries(prefer method 2 than method 1), because Queries are generated and may vary system by system. But I have seen first being used more.
The following program when generated will display a list of all User-Exits and BADI (Business Add-Ins) for the specified T-Code.
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Everything function that is to performed in SAP is represented in the form of a Transaction and to execute that Transaction, SAP provide a Transaction Code (T-Code). On the SAP Intial Screen, you can enter this T-Code in the T-Code field provided at the top.
