Questions about example sentences with, and the definition and usage of "Summarise"

A: Summarise means: when someone expresses the most important points of a speech, presentation, etc in a few short sentences.

A: Son el mismo verbo solo que summarise es resumiendo y to sum up en resumen o para concluir

A: It might be better to use "in short" in informal settings, and "summarizing" or "in summary" in formal settings.
To "sum up" might also mean 1+1, to sum means sommare in italiano. It can be used as a synonym of "to summarize".
Spero aiuti ^_^

A: × To summarise, the percentage of food waste is the highest, with the paper second, whereas the the percentage of plastic is the lowest.
✓ To summarise, the percentage of food waste is the highest, with paper second, and the percentage of plastic is the lowest.

Pretty good! You could say either “with paper second,” or “with paper in second” (like second place). Whereas was a good idea, but it’s for comparison, not ranking. “You do this, whereas I do that.”

A: To simplify from now on I will summarize the potato salad recipe document.

A: I decided to summarise a news article because I believed it was a challenging task, as news articles are already written concisely.

A: Since you are into American English, I think that it would be better if you will use summarize instead of summarise.