Standard actions are available to all users. They offer a limited set of possibilities compared to Extended actions, which require a Plus or a Pro user license (see below)
A standard action has these possibilities:
Extended actions offer more functionality and are available to users with a Plus or a Pro license. Users with a standard license will not see these actions in their user interface.
Extended actions offer all the functionality in the standard actions, and a host of additional power features.
The articles in the Creating and configuring actions guide explicitly state which features are extended and thus require users to have a a Plus or Pro license to use them.
Extended Pro actions
These are actions that are only available to users with a Pro license, and the functionality is only available in the FotoWeb Pro user interface.
The articles in the Creating and configuring actions guide explicitly state which features are reserved for Pro users only.