I am new to ABAP programming. To prepare myself for my new job, I am reading ABAP books. During reading, I learned that ABAP has several legacy elements to keep it backwards compatible with older SAP releases.
Regarding GUIs, I am reading about SAP-UI (PARAMETERS, etc.) Dynpros and WebDynpros. Now, I am unsure about on what to focus my learning efforts on.
Are the common rules like "You should know a little about basic SAP-UI, but mainly focus on WebDypros."
Background information: My new employee does SAP customizing for small and medium sized enterprises.