Drop-down menus get a lot of criticism for hindering usability, but sometimes they’re the best option. These tips will show you how to use drop-down menus for good, not evil. “Sticky” or fixed navigation menus can make a huge difference in a website’s usability. There are many pros and cons of switching to a sticky menu, along with some surprising statistics. Take a look at the results from real-life nav menu A/B tests. You will be surprised to see that a small change in copy or functionality can make a huge difference.
Accordion is the first alternative to tree navigation and occurs when the design pattern is clicked and the information is expanded. It saves space and reduces the chance for errors.
The second alternative to tree navigation are mega menus. If implemented correctly, they're great for navigation and allows for grouping of navigation options.
A sliding hamburger menu is the third alternative to tree navigation and is very common in apps and websites on mobile devices.
“Ideally, your navigation should be straightforward and as easy to understand as possible. If you have poor navigation, your users will get lost in the wilderness of your information architecture and tap out. That’s the last thing you want.”