Always create a web page thats consistent in design
The number one mistake I see when people create web pages is not staying with one web page design. For example, they create a navigation menu on the left on one page and one the right for another, or the background color is different.
Create a web page where the design is exactly the same from page to page. You'll look far more professional in the eyes of every person visiting your site.
When you create a web page and stick with the same design, organization and content layout is super easy and this makes for easy reading for your site visitors.
The final point to remember is to create web pages with a consistent design and stick with that design no matter how big your website.