I bookmark and often refer to trusted style guides. I typically access these style guides from bookmarks on my web browser at work.  I compiled this easy-to-share list of style guides so that we can all benefit. Feel free to share. Style matters. 

Technical content style guides

This collection of links includes online style guides I reference in my work as a technical writer. 

• Microsoft Writing Style Guide **
• Google developer documentation style guide **
• Google developer documentation API reference 
• Apple Style Guide
• DigitalOcean Product Documentation Style Guide
• GitHub style guide 
• GitLab Docs Documentation Style Guide ++
• Mailchimp Content Style Guide
• MongoDB Style Guide
• RedHat Style Guide
• Rackspace Style Guide for Technical Content ++
• Splunk Style Guide
• Styleguide.io style guide examples++ 
• 1Password Style Guide
• Write the Docs (WTD) website++ section devoted to style guides. 

** daily use

++ open for community updates with PR contributions

There are so many resources. I recently discovered a GitHub repo with a curated list of technical communication resources.