How can you access help for an unfamiliar tool?

The GIMP's native format is

What must a file have in order to save it with alpha transparency?

How do you manipulate text to create special effects outside the text editor?

How many images can you open at a time?

What must you do with floating selections before you can edit them?

What is the Shrink Wrap command used for?

What is the difference between the Paintbrush and Pencil Tools?

How do you change the size of a parametric brush?

What is the purpose of Dithering an indexed image?

Which filter changes affected pixels to a random color?