In SAP, A list of transaction codes may be found in table TSTC. The list with a description of the transaction codes is in table TSTCT (note the ‘T’ added at the end of table TSTC indicates the text description for the data in table TSTC is in TSTCT. SAP follows this standard most of the time). The data in the tables may be viewed in TRAN: SE16. Remember, when searching that the description field in table TSTCT is case sensitive.

Search for a Transaction in SAP
To search for a transaction code based on the text name of the transaction, use TRAN: SDMO
This search is not case sensitive in its search criteria so it is much easier to use than searching the TSTCT table.

Command Line
The command line is the white box on the upper left of the screen where you may type transaction codes. If your cursor is on the SAP screen, the <CTRL> key will tab the cursor up to the command line.  Sometimes it takes two or three tabs to pop the cursor into the command line.
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Here are some of the questions which you must know, when you say that you are good in Object Oriented Programming in SAP ABAP.

1.  Priniples of oops?
2.  What is difference between procedural & OO Programming?
3.  What is class?
4.  What is object?
5.  Can we instantiate a class within implementation of other class?
6.  What is deferred key word ?
7.  How we can refer to a class without defining it?
8.  Can we put non declarative statement e.g. START-OF-SELECTION within a class
9.  What is static attribute & method?
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Web dynpro ABAP is used to create Web based applications for SAP. All you need to know to start working on Webdynpro is a very good hands on experience in SAP ABAP and some basics of Object Oriented Programming.

So, where do I start if I want to learn Web dynpro ABAP:

1. Check out the training documents for absolute beginners in Webdynpro.
2. Checkout the blog by Thomas Jung on Web Dynpro Demonstration videos.
3. Checkout SAP Wiki on Webdynpro.

Do you know any other links on web dynpro? please share in the comment?

Update:Check out some of the tips and tricks and some more advanced tips and tricks.

A Business Application Programming Interface is a precisely defined interface providing access process and data in Business Applications Systems Such as SAP.

What are the Benefits of BAPI

• Can be used in diverse languages / Development Environments(ABAP, Visual Basic, Java, C++, etc.)
• Can be called from diverse platforms (COM, CORBA, Unix)
• Reduced development cost
• Reduced maintenance cost
• “Best-of-both-worlds” approach
• Rich functionality of the R/3 system
• User-specific front-ends

Steps involved in Creation of BAPI’s

1. Defining BAPI Data structures in SE11
2. Program a RFC enabled BAPI function module for each method
3. Create a Business object for the BAPI in the BOR
4. Documentation of the BAPI
5. Generate ALE interface for asynchronous BAPIs
6. Generate and release

Need more info? Download the 40 Page document on working with BAPI’s -> Working with BAPI\'s (1511)

GL Account Master Data  can be created using any one of the following methods:

1. Manually
2. Creating with reference
3. Through Data Transfer Workbench
4. Copying from existing GL accounts