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How to improve the usability of your website
Make sure the typography of your content is suitable.
If you have large blocks of text, make sure to use css to space out the lines accordingly. The longer a single line of text is, the greater the line-height of each line should be.
Also, make sure the font size of your text is big enough to read easily. Some sites have 10-pixel-tall text in verdana font; while that may look neat and tidy, you have to really strain your eyes to read the actual text.