Modern web technology isn't important to consider just because it's a shiny new thing. It's important because it provides solutions to problems that people building and maintaining web sites have struggled with for a long time.
This short video answers the following questions:
What is the focus of modern web technology?
What is the benefit of modern web technology?
How can you leverage modern web technology without re-architecting your platform?
How do you get started incorporating modern web technology in your environment?
What is the best approach to get started?
What are good projects to use to get started?