Yeah you are absolutely correct sir, but most user would prefer navigating through the left navigation list rather then clicking next.They would prefer to see the topic first before going on to the next page.Can't the navigating list be static, i mean if the user click any topic of the list,the list stays there and just the content page changes.
Can it be done by any means? I just wanted to know about it. At the other end the website is made amazing for any User. Its a good user friendly site used by many of the Web Developer and Designer.
#Respect for W3schools