OK, here are my two tips:
1. Write about things that you enjoy and are passionate about. HP allows you to choose your own topics so don't struggle with subjects you know little about or have no interest in!!
2. Don't give up if your hubs are not successful at first - persevere - if you follow the guidelines and write evergreen hubs - or at least a mix of long and short hubs - you should enjoy some rewards, both social and financial!