Such as: Ouch! Oops! Hey! Aargh! Aw man! Brrr (It's cold)!
These are examples of some things one might say in English. Some of them won't be found in the dictionary, but there are usually lists you can find online that will explain what they mean.
Here's a list of some common English interjections, as an example: https://www.englishclub.com/vocabulary/interjections.htm
Is there a reference like this in Esperanto?