Update your site more than once or twice a month! Not necessarily big updates, but do take the time of day to update. Or at least give a legitimate reason why you won't be updating. People are often more understanding than they are made out to be.
Try to make your layout 800x600 as friendly as possible if you're using a 1024x768 screen.
Have very few or no pop ups.
There's noting wrong with being user friendly, especially on a fandom site.
Make sure the text is easy to read, like a light background color and a dark text, or the other way around.
Don't criticize your work. If you do that people will less likely be interested in your content. Be positive about your own work. People will be more prone to come back and see how you've improved.
Don't use fonts that you've downloaded for the text on your webpage. That usually means that other people may not have it, and your font will automatically be reset to the default on the other person's machine. The best fonts to use that most everyone has are; Arial, Verdana, Times New Roman, Tahoma, and Curiror New.
If you've put your site on a hiatus, try your best and reopen the site, or at least come back in a few months and say that your hiatus has been extended.
For the love of god don't hotlink! (You know, copy and paste an image, even if there is a link back.)
Give proper credit for everything (except for the things you've made). Especially brushes and textures. And if you're using artwork (digital or painted) be sure to give a clear linkback on the page it's been used on.
Avoid broken links and images at all costs. They can be amazingly annoying.
A golden rule; StIcKy CaPs ArE nOt CoOl! a ReVaLaTiOn To SoMe pEoPlE...
Try your best to use proper grammar, spelling, and punctuation. The #1 most common error I see in websites, is people not understanding the difference between 'Your and You're." the #2 most common error is the proper usage of an apostrophe. Remember (for the love of god, please remember): "Aly's shows Aly is, Alys' shows ownership"