Sometime it becomes hard for some of us to choose and write a topic on steemit. Before choosing a topic search and find the trending topics on steemit. You can find it on the lift side of the screen. No matter how frequently it is. Write your topic and make it simple and easy for the readers to understand it easily. After choosing the topic. make it categorized and you must have enough information for that topic. If u don't have then search for most important information. And add those information and avoid unnecessary things. If you add unnecessary words to your topics and trying to make your topic long. It will make the readers bored and your topic might looks not useful. And it will take more time of the readers. The reader may find your topic wasting time on it. Always focus on quality rather then the quantity. 
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List of topic you can write on it.
Art
culture
Geography
places
Health
fitness
History
events
Mathematics
abstractions
Natural
sciences and nature
People and self
Philosophy and thinking.
Bitcoin
Animals
Steemit good points
Bloging
Creating website
WordPress
How to create youtube channel
This is so timely for days i don't becuse of the lack of a topic ,i will choose from those and wirte my article ...nice post