SAP Help Teach yourself ABAP from no knowledge, first step is to log into SAP then write basic hello world report
Beginners Guide to learning SAP development starting with logging into SAP
The most common questions I am asked are along the lines of what is the best way to learn ABAP? Where should I start? I have little or no knowledge
of ABAP can you recommend a book to get me started. The fact is that much of the knowledge you need to get you started with the basics and beyond in
most areas of SAP development is available from a combination of SAP Development/SAP Development and other complimentary websites and
online video courses.The trouble is it is very difficult to access and know where to
start if you are starting from little or no existing knowledge.
There are many existing guides for each area you need such as report writing, table updates, ALV, BSP's, SAP enhancement, Fiori, Web Dynpro's
etc etc. This section will hopefully tie all these together into a beginner's step by step guide to SAP / ABAP development. Taking you from
the very very basics of simply logging in SAP, through to developing ABAP reports, ALV grids, update programs, right through to
developing the latest SAP web development applications using BSP, HTML, JavaScript, Web Dynpro's etc etc.
Prerequisite: Before you start do you have access to an SAP system to practice what you are learning? If not then check out the following review, which details the best options for gaining access to an SAP system. This can either be by installing a local trial version on your own PC or signing up for instant remote access to a fully working SAP system.
SAP Access review - Getting access to an SAP system
Lesson - Log into SAP 
Lesson - Basic Helloworld ABAP report
Lesson - Basic ABAP report
Lesson - Add Selection Screen
Lesson -- Format date field
Lesson -- Fully working ALV Tree dynpro program