What is one of the top mistakes beginners should avoid when creating a website?

For beginners creating a website, considering mobile customers is crucial due to the increasing reliance on mobile devices for internet access. A significant portion of users browse the web on smartphones and tablets, so a site that is not optimized for mobile viewing can lead to a poor user experience, high bounce rates, and loss of potential customers.

A mobile-friendly website adjusts its layout and features to ensure usability on smaller screens, which is essential for retaining visitor engagement and encouraging interaction. As a result, this mistake can severely impact the site's effectiveness and reach, making it a critical area of focus for anyone looking to establish a successful online presence.

In contrast, while the other options address important aspects of website development, they may not have the immediate and broad impact that ignoring mobile compatibility can have.