First of all, welcome to Hubpages. I hope that you will succeed in this writing site. You can write a good hub by writing about a topic that you know about very well. For example, how to look after an elderly relation like your grandfather or how to do gardening. There are lots of varied topics here that you can write about. Try and read and have a look at other people's Hubs here then you will have an idea on what to write about that catches people's attention.