We are about to do a Notes Story Board app with SF and Android files. But since that is taking a while, I read some other how to write books. The best by a long way is by one of my favourite SF authors Adam Roberts:
Get Started in Writing Science Fiction and Fantasy: How to write compelling and imaginative sci-fi and fantasy fiction (Teach Yourself: Writing)
That’s quite a long title. The text is in the usual Roberts style, witty, erudite, slightly challenging. He provides breakdowns of what makes SF and Fantasy different. And even includes a plotting system at the end, to help you think up new ideas and stories. So it is very good on analysis and practical matters pertaining to writing about warp drives, time travel, magic, matrices, and all that. And why you might want to do that in the first place!
You can get the book on Amazon or Ebay for quite a reasonable price.
Here is a link to Adam Roberts sf writer wiki, since his website which is out of date for some reason.