Well on firefox/chrome extensions you can search for text expander and choose an extension that works for you.

Or if you are using a phone you can do the same on the app store and I think there should be a few options.

Once you download one of them it should give instructions on how to use it, but in general it asks you to create a phrase that you want to be automatically triggered and a shorter phrase that automatically replaced with the longer phrase.

For example-

long phrase: The quick brown fox jumped over the moon.

short phrase: /qfox

and every time you typed /qfox it would replace it with “The quick brown fox jumped over the moon.”

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