A family of Microsoft presentation graphics products that offer tools for creating presentations and adding graphic effects like multimedia objects and special effects with text.
Text in Content placeholders (the boxes that start out with Click Here To ... whatever) behaves differently from regular text boxes and text inside shapes like rectangles.
Text in Content placeholders will work as you expect; tab will indent the text one bullet level and assume that bullet level's formatting (as defined in the layout the slide is based on). Conversely, Shift+Tab will move the text one indent level to the left.
Text in regular text boxes won't behave this way. There's an Increase Indent Level and a Decrease Indent Level button on the ribbon which goes maybe 1/4 of the way to producing the kind of indents you'd like. It's in the Paragraph group of the Home tab: