Who needs what and who's asking?
many times communication is dropped. To achieve greater goals you need to do your homework first on a topic, then gather information. Then you need to choose your audience and who will be the most effective. Once you choose your audience you need to gear your presentation to with all the learning styles.
Researching your audience is very important. You definitely don't talk to teens the same way you do adults. There are a lot of other factors to consider as well.
You cannot reach everyone all the time, but you can go back so no one gets left behind.
This is absolutely correct - Tailoring your communication based on your audience's needs is essential for effective communication.