Kiss Metrics wrote an article that I believe is worth reading for anyone building websites on their own and is looking for tips on what to do and what not to do.
The article contains 5 mistakes that are commonly made by webmasters. The site also gives 5 examples of websites that get it right.
The mistake I found most interesting was drop down menus. I don't dislike them when I am on a website, but here is what they said in the article:
Mistake #3: Drop Down Menus
Drop down menus are bad for two reasons. Depending on how they’re
programed, can be difficult for search engines to crawl. But there’s
another, bigger reason…
Drop down menus are annoying, according to usability studies
from the NN Group. This is because as visitors, we move our eyes much
faster than we move the mouse. When we move the mouse to a menu item,
we’ve already decided to click…and then the drop down gives us more
options. It’s a moment of friction in our minds as visitors.