Good for you for taking on teaching! That's such an important task, and a challenging one!
I think focusing on teaching your students a well-rounded approach to the basics of front-end dev is a good approach to take. Trends and tech change so quickly on the web, but anyone with a solid foundation in code (HTML, CSS and JS) and an appreciation for what makes good UX will always have the tools they need to keep up. It's those basics and the people skills that make for a strong web career!