I like these 10 tips for clear writing from the GOV.UK team. The tips can be used by anyone to help their writing and are not specific to technical writing.

(To skip the podcast, scroll down the page to see the list of 10 tips)

https://gds.blog.gov.uk/2019/08/27/podcast-on-writing/

The 'Writing for GOV.UK' guide is also full of good writing advice for people publishing content on the web:

https://www.gov.uk/guidance/content-design/writing-for-gov-u...