The phrase "takeaway message" means the most important thing to remember or learn from a particular message or conversation. It's like the main point that you should keep in mind. Full definition
In this video, Dr. Brandt discusses the main takeaway messages from the 2018 New Horizons Forum session on Glaucoma Drug Delivery and his outlook on the future of drug delivery platforms for treating glaucoma. (glaucoma.org)
For this was the key takeaway message for me at this year's London Book Fair Digital Conference, which I attended and live - tweeted last weekend: if publishers don't produce digital content, such as apps, there are plenty of men in their basements in Basingstoke in their pants who will. (publishingtalk.eu)
There are several key takeaway messages. (idmprogram.com)