Don't put too much text!
Make page content easy to scan. Keep Content as Concise as Possible
Users don't read the text on your page, they scan it. You'll spend hours - maybe days - writing your page content and it's really annoying to think that visitors may read less than half of it. Format your content so that it's easy to scan. Emphasize important points (or product characteristics) with a combination of header tags, bold type, color, or lists.
It's pretty well known that web users have very short attention spans and that we don't read articles thoroughly and in their entirety. A study investigating the changes in our reading habits behaviors in the digital age concluded that we tend to skim webpages to find the information we want.
Get to the point as quickly as possible.
Cut out unnecessary information.
Use easy-to-understand, shorter, common words and phrases.
Avoid long paragraphs and sentences.
Clear and simple navigation
According to Web usability expert, Jakob Nielsen, a good navigation system should answer three questions:
Where am I?
Where have I been?
Where can I go?
Home page link inside your main navigation
Visitors may enter your site via an internal page, but hopefully they'll want to head for the home page next.
Company Logo Is Linked to Home-page
This may sound minor, but people expect logos to link to home-pages, and when they don't, confusion follows. I've seen video of users clicking on a logo over and over, with no idea what to do next.
Place your most important content high on the page
Don't save the best for last.
Place your most important content high on the page. Think of a newspaper: the top story is always prominently displayed above the fold. Check your page display at in a number of different screen resolutions to make sure that your most important content is visible when the page loads.
Keep it consistent
Use a Web site template to enforce a uniform page structure. Visitors should be able to predict the location of important page elements after visiting just one page in your site.
Visitors should never click on an internal link in your site and wonder if they've left your Web site. Choose your colors and fonts carefully and use them consistently throughout the site.
Just say NO to splash pages
unless your entire website is essentially a splash page (a single-item promotion site, like for a movie), don't annoy visitors by surprising them with a full-page ad when they're expecting your website. Put the promotion content on your home page instead, so it's still immediately-visible while giving visitors the choice on whether to act on it or not – for example, they're in a hurry and want to click on a menu item, not be greeted with a full-page ad.
Clear and Short domain name and links as short as possible
Having clear and short permalinks on your website not only makes it easier for people to share the URLs – since they fit easier in places where they're pasted – but you reassure them what they're reading or about to read, since they can clearly see what the page/post will be about, rather than a bunch of gibberish like numbers and symbols.
Don't Worry About the Vertical Scrolling
There has long been a myth that all of your important content should be above "the fold," a term borrowed from newspapers that refers to the area of a web page that can be seen without having to scroll down
So, are long pages bad? Should we cram everything at the top of our web layouts because people won't ever read anything below this fold?
The answer is "No" according to a report by Clicktale, a web analytics company. Their results showed that the length of the page has no influence in the likelihood that a user will scroll down the page.
So don't load too much intense content on the first section of your site. By having a more clear navigation, you will invite users to scroll down the page.
Don't Design Misleading links & UI Controls
Don't design graphic elements that looks like a button, but is not. We often see text that is underlined and looks like links, but are not clickable. By not having the action that the users were expecting, they would think that the site is broken and eventually leave. One other important usability tip regarding UI controls is consistency:
Structure your Typography Carefully
Typography is another whole can of worms included in the subset of design. You don't need to master creating your own font or how to display individual custom letters in digital text. However as a designer holding a basic understanding of typography with usability tactics can work wonders.
A poisonous myth passed around the design community is how great smaller font sizes are. Arial set to 11px may look clean and professional but it's awful when it comes to user experience. Setting your paragraphs to a more-than-readable size is highly recommended, especially with mobile users growing.
Be sure to add plenty of breathing room between your page content as well. Nobody wants to try and read 15 paragraphs of tightly bunched-up text split by a few headings. The CSS line-height property is a very useful yet under-utilized setting. This property sets how much space is placed between each line in a paragraph or in headings and other typographic elements.
When you get into developing page styles with CSS the workload is much simpler. By this I mean it's much simpler to change a numerical value in your CSS compared to editing an entire PSD document. Try messing around with different values of line-height to see which works best for your design.
What should i ask?
Set tasks that are essential to the new site's success, such as:
Contacting the client
The site was built for a reason - can your target audience do what you need them to do?
It's also a good idea to ask the user to suggest tasks. While this gives another indication of their expectations and requirements, it may suggest new functionality or priorities
How many users do i need ?
Effective User Testing Doesn't Have To Be Extensive
Jakob Nielsen's study on the ideal number of test subjects in usability tests found that tests with just five users would reveal about 85% of all problems with your website, whereas 15 users would find pretty much all problems.