I'll be glad to tell you what I know. But I do not consider myself an authority!
Begin by reading the tutorials and high ranking hubbers.
Notice what they have in common, good writing skills, including command of the language and proper useage, linking ideas together, making the topic flow from one point to the next.
If it is of interest to you, it will be interesting to someone here. Write on the things that appeal to you first.
Interact with the community, respond to those who leave a commentary on your hubs.
Read, read and read more from your fellow hubbers......it is the equivalent of meeting people and getting to know them.