I hope you aren't too discouraged by the number of actions that exist - I would speculate that there are around 30 or so you run into on a frequent basis (query, repeater, JCO/JRA, tracer, conditional, assignment, etc). Many of them are very specialized and have a very targeted use case that you may never encounter in the context of your requirements.
The online help documentation does provide a handy table based reference to the in/out properties for the actions. The configure dialog just allows you to set the properties in a more convenient (sometimes necessary) capacity then doing everything through the link editor.
I've always shown people that when you put entries in the configure dialog and then look at the alternate hover text in the link editor it will help you correlate the link property name to the configure dialog. Using this in context, along with the help documentation, the very helpful tracer action, and a bit of trial and error intuition should get you quite far in your learning process.
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