A little exercise
Although part of the training for the writing of instruction books it's also handy for learning how to write any type of book.
Write instructions an alien can read on how to brew and make a cup of tea.
Another one is write down how you would show an alien how to brew and make a cup of tea.
(In your own language of course, not that of the alien!)
The two may sound the same but they are not.
Myself and my friend combined know everything there is to know, but he's not here.