Make your hub interesting by incorporating pictures, illustrations, videos and other visual aids that will help illustrate the point of your hub. People like variety and there are quite a few visual aids we can make use of.
Use the text-enhancing features available like bold, italics and underlining. They all add interest.
Keep your hub to a reasonable length; but, add hyperlinks to other articles and sources of information so those who want more information can get it.
Make your first sentence or two attention-getting to encourage the reader to continue reading. It's in the first couple sentences that you either grab or lose your reader.
Don't make your paragraphs too long, this can make the hub seem daunting and too complex to finish.
Make your hub rich with imagery and full of detail so the reader can really see the issue. Nothing loses readers faster than dry, technical material.
Hope these hints help!