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If you want to show or hide items(or regions) on the page depending on what choice the user made, use(and learn) dynamic actions.
If you need to change server session state, you'll do it in a computation to change one item or do it in process for everything else.
IF and CASE statements are similar in functionality and you'll find good descriptions on the net using the keyword "PLSQL CASE IF".
Note: There is a difference between a CASE statement and a CASE expression even do their syntax are almost the same.