(Often original old Apple installers/updaters have expired certificates. An old tip was to set the system date back to allow them to be installed.)
 

• Xcode 12.5.1 (for macOS 11.0 or later)
  - Addresses a stability issue related to opening the Organizer window.
  - Fixed an issue where XCTest code wasn't generated after pressing the Record button.
  - Additional bug fixes and stability improvements.
  
  
• Apple Fitness+ releases new episodes of Time to Walk starting June 28 (pr)

• If you can't send or receive email on your Mac
  
  
• If your external display isn't detected or appears blurry on your Mac
  (was titled "Get help with video problems on external displays connected to your Mac")
  
  
• Get help with your Mac notebook battery
  
  
• About battery health management in (Apple Silicon) Mac notebooks
  
  
• (How to) Update macOS on Mac
  
  
• If an error occurred while updating or installing macOS
  
  
• If you get a personalization error when reinstalling macOS on a M1 chip Mac
  
  
• If Safari doesn't open a webpage or isn't working as expected
  
  
• (How to) Delete spam calendars and events on iPhone
  
  
• If your AirPods won't connect
  
  
• If your left or right AirPod isn't working
  
  
• Wearing your AirPods, AirPods Pro, AirPods Max, EarPods, or Beats devices

• Firefox 89.0.2 release notes has 1 Linux related bug fix.
  
  
• Sony A8/A9 Series OLED TVs Firmware Update 6.5066
  - post includes info and firmware update download pages.
  
  
• Chrome 91.0.4472.123/.124 Stable Channel Update (google)
  - Windows only? (There was a previous update for Macs)