What is Semantic Web? Proper web development is universally understood, thanks to internationally recognized standards.
Most recognizeably, w3.org, aka the World Wide Web Consortium(W3C) is a global community that sets the standards we follow.
Best practices go far beyond what the users experience. In development, there are unlimited ways to create the same end result. A more skilled developer writes code in such a way that future development, and future changes in the web are considered.