Is it takeaway or take away?
It can be takeaway or take away, depending on the grammatical context.
The spelling is “takeaway” (one word) for the noun meaning “an important insight” (e.g., “I added a key takeaways slide to my presentation”).
However, the spelling is “take away” (two words) when it’s a phrasal verb (e.g., “What are the most important insights that the participants should take away from the workshop?” or “You’re not allowed gum; the teacher will take it away if they see it”).
QuillBot’s free Grammar Checker will tell you instantly if “takeaway” or “take away” is correct.