Technical writing should be clear and concise. Always try to convey your core idea as directly as possible.

Here are some resources I find useful for this:

http://www.hemingwayapp.com/

https://www.plainlanguage.gov/guidelines/

I’m intrigued by https://www.grammarly.com/ but it sends everything you write to their cloud service, which is completely unacceptable to me. If I can’t use the tool for proprietary and private writing, it’s useless.