Semantic code is essential for website development because it enhances accessibility, improves SEO, and ensures better readability and maintainability of the code. By using semantic elements, developers can create websites that are more understandable for both users and search engines, leading to a better user experience and higher search rankings. Additionally, semantic code makes it easier for other developers to read and maintain the code, fostering collaboration and reducing the likelihood of errors.

When designing a website, you need to have some idea of the design, visual style, structure, and features before the coding process begins. However, some developers choose to code while working on a project simultaneously.

Currently, I am familiar with the W3C Markup Validation Service, a free validation tool that I find user-friendly for checking code. It is essential to use these tools to ensure the website's code adheres to web standards, validating the site's professionalism.