What’s the difference between cancelled and canceled?
There’s no difference in meaning between cancelled and canceled; they’re just two different spellings of the same word, the past tense of the verb “cancel.”
Cancelled (double “l”) is the standard spelling in British English, canceled (single “l”) in American English.
Make sure to pick the spelling appropriate to the context you’re writing in and stick to it consistently. The QuillBot Grammar Checker can help you with this.