A common mistake that many people make when writing web copy or website content online is to assume that all their readers have all the time in the world to read a lot of words and go through an entire sea of text. Another common assumption is that people believe and remember everything that they learn online. However, the online writing arena is so much more competitive than the offline world: printed words are meant to be read, but online words are meant to be skimmed.
When you are writing copy, you need to speak your readers language. This requires knowledge of both tone and structure. In terms of structure, you need to follow your readers thoughts: your reader is thinking in terms of ideas, so present them quickly and in palatable shots. Have all your salient points ready and available in subheadings or bullet points. This can make it easier for your reader to skim through your copy and find what he or she needs. This also makes it more inviting for your reader to actually go through the work: by providing white space, you also give your readers eyes the chance to rest once in a while.
Now that you have drawn your readers in and made them stay, its time for...