Check out the cheat sheet for this site version 7.
The cheat sheet has gems like, “An error with a parameter is usually the culprit breaking a form. Parameter ‘name’ can be letters, underscores, and numbers. It must not have a space and cannot be only a number. Parameter ‘show’ (used with [calc]) can be true or false (no quotes). Parameters with numbers (size (used with [text]), cols and rows used with [textarea]) also have no quotes.”
And For Even More Information …