Make text larger with this shortcut. Use Ctrl+Shift+> when you want to quickly adjust text size in a place holder. The text will grow by the same intervals displayed when you click the font size dropdown box.
Quickly change to smaller text in a place holder by selecting the text and hitting Ctrl+Shift+<. Text will shrink by the same intervals displayed when you click the font size dropdown box. You can drop all the way down to 1-point text.
Draw a shape and quickly make it a navigation button by creating a hyperlink with Ctrl+K. You can use the Hyperlink Dialog Box to select anything from a website, to another file, to another slide within the presentation.