The automation TextExpander handles is text replacement and form filling, it's more popular on the Mac but that's one reason to pick this over other text replacement tools in that it's cross platform.

It is a way to increase your typing output without actually having to type.

The one I use the most is TextExpander, it's by far the best of its type in the Apple ecosystem but since it's available on Windows too it's a good choice to keep all your snippets (text replacement rules) synced across everything.

This is important because it will sync your saved settings. In the case of TextExpander the settings or data are your snippets.

The principle of a text replacement or expansion tool is that you will write a short piece of text that can't be confused for something you will actually need and this gets replaced by usually a longer piece of text that's more meaningful.

If you need to type your postal address then you could type something like "xadd" and TextExpander will automatically replace that with your pre-set entire formatted address.

You can take this much further or even smaller and use it to save thinking time. For example if you can't remember a particular number you will need to type out more than once, it will be easier to remember a shortcode system (e.g. I use it for my registered company number). Even if the shortcode/abbreviation isn't that much shorter it can increase your speed that would have been slowed by your disrupted time in thinking or referencing information.