That is as true for fiction or non-fiction. The writer has to really know their subject. It is really important to remember that the readers are a lot smarter than the writer. Also, good writing has to do with rewriting. You will never get it right the first time. So you rewrite and rewrite again until you get it right. Until you, and the reader, will be able to visualize what you're writing about.

Perenelle shuddered. "You know I hate leprechauns more than almost anything.

I love inside jokes. I hope to be a part of one some day.

Some writing courses will advise you to write what you know. I've always thought this is very odd advice ... because it means, for example, that I should not be writing about Nicholas Flamel, because I didn't live in France in the 15th Century, I was not an alchemyst, am not immortal (despite the rumours) and do not know magic.

I have always been interested in mythology and history. The more I read, the more I realized that there have always been people at the edges of history that we know very little about. I wanted to use them in a story and bring them back into the public's consciousness. Similarly with mythology: everyone knows some of the Greek or Roman legends, and maybe some of the Egyptian or Norse stories too, but what about the other great mythologies: the Celtic, Chinese, Native American?

That is as true for fiction or non-fiction. The writer has to really know their subject. It is really important to remember that the readers are a lot smarter than the writer. Also, good writing has to do with rewriting. You will never get it right the first time. So you rewrite and rewrite again until you get it right. Until you, and the reader, will be able to visualize what you're writing about.

Master the rules of the game until you can play it better they can.