Producing instructions and explanations require clear, unfussy writing. This is quite different from what you do in creating stories or persuasive writing.
The writing of instructions and explanations is good training in thinking and expressing yourself concisely and accurately.
What is wrong with this set of instructions for finding your way to a school?
'If you go down the road you will pass the most magnificent church that was built in 1873 by the architect Roger Scott. I go there every Sunday with my wife and our spirits rise like freshly baked bread. The school is about a mile after that. Oh yes, you will need to turn left at the shop. There are a couple of roundabouts as well. You can't miss it.'
There are several problems here. There is irrelevant information. You do not need to know a lot of what is given. The speaker has not thought about what is needed and what is not, and this shows a lack of discipline.
Even the irrelevant information is embellished and exaggerated with adjectives ('magnificent') and figures of speech (the simile 'like freshly baked bread') that are not needed.
