The example that you showed didn’t really do anything fancy with the text, so you can probably get by with just some basic knowledge about how to animate layer properties in general.
There was also a bit of drop shadow on the text, so you might want to learn about layer styles, too.
Finally, the text was on top of an animated background that took up the bottom part of the frame. This is usually referred to as a ‘lower third’. The animated background in this case (as in so many cases) was probably made with the Fractal Noise effect or the Turbulent Noise effect. You’ll need to learn how to apply effects to solid-color layers and then use masks to reveal only a portion of the layer.
The whole composition for your example is probably four or so layers: the underlying video layer, the masked layer with some animated background, and one or two text layers with their Position properties animated.
If you do want to get fancy with per-character text animation, answer back.
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Todd Kopriva, Adobe Systems Incorporated
putting the ‘T’ back in ‘RTFM’ : After Effects Help on the Web
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