Hi @mario248 - Great question.
Considering you have an experience in AEM (Front end / back end both), AEP is more towards data oriented, built on RESTful API where we're building solution that drives customer experience.
To get into AEP, I would suggest to learn some fundamentals about Web analytics, Personalization, data collection and how it works collectively through various other adobe products like Adobe analytics, Target, Adobe data collection( Adobe launch) etc as basics.
Once you start to learn and integrate these with your AEM or any other application where you can able to see how the data flows end to end and that deliver personalization experience based on the segmentation and later on build the real time customer profile in AEP using various services built on top of AEP.
This high level architecture diagram helps more to understand and give you a walkthrough about AEP.
By the way, AEP UI interface used React Spectrum for the client side, which is the same UI toolkit used by all Adobe solutions
Hope this helps.
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