For multimedia presentations, take advantage of the new HTML5 standard. Although HTML5 isn't quite as robust for animation and games as Flash, it has the advantage of working stably on mobile phone browsers, including those contained in Apple hardware. HTML5 is also quite a bit leaner than Flash, so load times will improve, as well.
Although it is common to see the www. at the front of a website URL, you should try to make sure that you can access your site whether you choose to include it or not. This will make it much easier for anyone to access regardless of how they type it.
Avoid using frames. Most sites have abandoned frames on their own as better alternatives have become available, but there are still sites out there that are trapped in 1996. Alternatives to navigational frames include fixed-position navigation panels, having navigation in multiple areas (e.g. left and bottom) or simplifying page structure so that navigational links are never far away.
Avoid cramming page elements together. Each section of your page should be naturally separated from each other, as this makes the purpose of each section more clear. The easiest way to separate sections is by using DIVs, but there are other ways, including absolute positioning (not recommended), the CSS margin command, and floats.
Avoid creating user interface (UI) controls that mislead your visitors. These controls include elements, widgets and more that create an interactive experience, such as a link, drop-down list or button. You do not want to make visitors think that clicking on an underlined word or phrase for example, will lead to a new page if it is not actually linked to something else. When your visitors have expectations of something working a certain way and it does not, they are more likely to assume there is something wrong with your site and leave.
Do not use blinking, scrolling text or other animations. Also, steer clear of sounds or music that plays automatically. All of these things are distracting to users and provide nothing of value. In addition, connection speeds vary from one site visitor to the next, and everyone does not have the same speed. Those users with slower connections will resent the slow-loading elements of your site.
Pop-up windows are one feature you should avoid. Pop-ups are an irritating distraction, at best, for most web surfers, and the possible benefits you could reap with them are extremely modest. When the windows pop up, many people become frustrated and decide to leave the site rather than see what information is available.
Because there is some coding involved with website design, it is often thought of as difficult. As you can see now, there isn't that much to it. If you use the advice that has been provided, you're certain to produce an impressive site.