An important skill to master is communicate clearly in simplest form possible. You can write maybe 3 paragraph to explain on something but you have option just to write maybe 2 sentences to cover what you want to deliver.
Something that you need to consider when writing.
1. Level of understanding on the recipient side. It varies among different people. So try to suit them.
2. Use shorter sentence
3. Re-read before send and try to make it even simpler. Remove the unnecessary. Simplify the rest.
When you can master this skill, your message will become clearer to the recipient. Less problem will raise because of misunderstanding or even not understand at all.