How to add tooltip for Interactive Grid column headers.
Here is how add tooltip help to list entries. You need modify or create new list template and add title attribute.
How add tooltip help to interactive report column headings.
Here is how you can add item help using title attribute to APEX form items.
How to add tooltip help on APEX 4 classic report headers using dynamic action.
How to show APEX item help text in modal dialog using SimpleModal jQuery plugin.
How to show APEX page help in modal dialog using jQuery SimpleModal plugin.
Adding help text to column headings in a tabular form.