To teach coding standards to junior web developers, start with clear documentation outlining the standards, including naming conventions, formatting rules, and best practices. Provide hands-on examples and code reviews to illustrate how to apply these standards in real projects. Encourage junior developers to ask questions and seek feedback to reinforce learning. Incorporate regular training sessions and code reviews into your team’s workflow to ensure adherence to coding standards. Additionally, lead by example by following the same standards in your own coding practices.