"Writing about a different topic could be unpleasant because it's unfamiliar, and it's more enjoyable to stick to an area where you already have considerable expertise. One approach to simply be aware of that problem and structure your work as a learning project. For example, when you are learning a new topic, you are in a unique position that experts in the field have lost -- you understand exactly what things newcomers are likely to find confusing and misleading. You're in a great position to write tutorials and introductions and 'how I learned about X' pieces.
In effect, for any unfamilar topic area, you are already an expert at one aspect of that topic: the problem of learning that topic. This can help reduce the challenge of tackling new subjects to enjoyable levels." ronburk
