Majorly used Transaction codes in abap:
SE01 – Transport Organizer (Extended view)
SE03 – Transport Organizer Tools
SE09 – Transport Organizer
SE10 – Transport Organizer
SE11 – ABAP/4 Dictionary
SE12 – ABAP/4 Dictionary Display
SE13 –Dictionary Technical Settings
SE14 – ABAP/4 Dictionary: Database Utility
SE15 – Object Navigator
SE16 – Data Browser : Initial Screen
SE16N – General Table Display
SE17 – General Table Display
SE18 – BADI Builder :Initial Screen For Definitions
SE19 – BADI Builder : Initial Screen For Implementations
SE21 – Package Builder: Initial Screen
SE24 – Class Builder : Initial Screen
SE29 – Application Packets
SE30 – Run Time Analysis : Initial Screen
SE32 – SAP
SE33 – Context Builder : Initial Screen
SE35 – Maintain Dialog Modules
SE36 – Logical Database Builder
SE37 – Function Builder : Initial Screen
SE38 –ABAP Editor : Initial Screen
SE39 – ABAP Splitscreen Editor : Initial Screen
SE41 – Menu Painter : Initial Screen
SE43 – Area Menu Maintenance
SE51 – Screen Painter: Initial Screen
SE54 – Generate table Maintenance Dialog : Initial Table/ View Screen
SE55 – Generate table Maintenance Dialog : Initial Table/ View Screen
SE56 – Generate table Maintenance Dialog : Initial Table/ View Screen
SE57 – Generate table Maintenance Dialog : Initial Table/ View Screen
SE61 – Document Maintenance :
SE62 –Short Text Conversion – Activation
SE63 –Translation
SE71 – Form Painter
SE72 – Style : Request
SE73 – SAP Script Font Maintenance : Initial Screen
SE74 – SAP Script Format Conversion
SE75 – SAP Script Settings
SE76 – SAP Script From Translation
SE77 – SAP Script Style Conversion
SE78 –Administration For Graphics
SE80 – Object Navigator
SE81&SE82 – Application Hierarchy : Display
SE83 –Display Reuse Library
SE84 – Object Navigator
SE85 – Object Navigator
SE90 – Object Navigator
SE91 –Message Maintenance : Initial Screen
SE92 – Maintain system log messages
SE93 –Transaction Code Creation
SM12 – Lock table entries (unlock locked tables)
SM04 – User List
SM30 – Maintain Table Views : Initial Screen
SM31 – Maintain Table Views
SM32 –Table Maintenance
SM35 – Batch Input : Session Overview
SM36 –Define Background Job
SM37 –Simple Job Selection
SM50 – Process Over View
SM51 – SAP Servers
ST01 – System Trace
ST02 – Tune Summary
ST05 – SQL Trace
ST22 – ABAP Run Time Error
WEDI – EDI Menu. IDOC and EDI base.
WE02 – IDOC List
WE07 – IDOC Statistics
SPRO – Customizing : Execute Project
SU01 – Display User Name
SMOD – SAP enhancements
COMD – Project Management For SAP Enhancements
SHDB – Recording Overview
SMARTFORMS – For Smart Form Creation
NACE –Conditions For Output Control
LSMW –Legacy System Migration Workbench
SP01 – Output Control: Spool Request Selection Screen
SP02 – Output Control : Spool Request List
SO10 – Standard Text
AL11 – Application server path