Sometimes listeners may ask questions at the end of your speech that are unrelated to your talk. by finding a way to gently guide your questioners back to the message you are

By finding a way to gently guide your questioners back to the message you are: staying on the message.
By doing this, you can keep the discussion to stay within your expertise. On top of that, you would not ramble in front of your audience which could make you lose some part of credibility in the perception of your audience.

Advances in learning and technology made long ocean voyages possible