Here is the link for ATG documentation
I would suggest first go thru the ATG Installation and Configuration Guide
then Platform Programming
then Repository Guide
then personalization guide
then page developers guide
For ATG Commerce go over Commerce programming guide
For Commerce store page developer guide
These are basics then you can go forward based on this
If you want ATG Certification this thread might help you .
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Hope it helps
Following link will be helpful -
I find myself very hard to understand ATG documentation. Dose anyone know better way to learn it? there is no singe help file like have it on MSDN, these ATG documentation page developer doesn't refer anything to programming guide(I mean specific link to related topic) and other related topic which is needed for programming. Even though if you think you may have found the subject one click reset the frame on lift side….just tooooooo much time consuming.
I know little bit of ATG but I want to grow my knowledge any suggestion, Please?