Lets have a look at most important and commonly used TCODES by an ABAP developer. You can use it as a cheat sheet:
| SL NO. | TCODE | Function |
| 1 | SE37 | ABAP/4 Function Modules |
| 2 | SE38 | ABAP Editor |
| 3 | SE39 | Splitscreen Editor: Program Compare |
| 4 | SE41 | Menu Painter |
| 5 | SE43 | Maintain Area Menu |
| 6 | SE09 | Workbench Organizer |
| 7 | SE10 | New Transport & Correction screen |
| 8 | SE11 | ABAP/4 Dictionary Maintenance |
| 9 | SE14 | Utilities for Dictionary Tables |
| 10 | SE16 | Data Browser: Initial Screen |
| 11 | SE24 | Class Builder |
| 12 | SE30 | ABAP/4 Runtime Analysis |
| 13 | SE51 | Screen Painter: Initial Screen |
| 14 | SE63 | Translation |
| 15 | SE71 | SAPscript layout set |
| 16 | SE78 | FOR GRAPHICS |
| 17 | SE80 | ABAP/4 Development Workbench |
| 18 | SE91 | Maintain Messages |
| 19 | SE93 | Maintain Transaction |
| 20 | SM12 | Lock table entries |
| 21 | SM30 | Maintain Table Views. |
| 22 | SM37 | View background jobs |
| 23 | SPRO | Start SAP IMG (Implementation Guide) |
| 24 | ST22 | ABAP Dump analysis |
| 25 | SU53 | Display Authorization Values for User. |
