Welcome to the Network UPS Tools (NUT) project Wiki, and feel free to contribute tricks and insights.

While there are several good entries in the menu, ones referenced most frequently in issue discussions include:

• Building NUT for in-place upgrades or non-disruptive tests (including the build prerequisites for different platforms in-tree or as a rendered page on NUT website) and Using NIT (NUT Integration Test suite) sandbox
• Technicalities: Customizing (NUT) config files and scripts delivered by packaging
• Links to distribution packaging recipes and repository sections
• Troubleshooting upsdrvctl drivers not starting ("insufficient permissions on everything" or "Can't claim USB device [VVVV:PPPP]@0/0: Entity not found") possibly due to nut-driver-enumerator (NDE) services having been there before you with NUT 2.8.x, and "insufficient permissions" when starting USB drivers for a different PoV on this; see also an example unit deployment detailed in NUT systemd service units page
• Changing NUT daemon debug verbosity
• Building NUT integration for Home Assistant
• Running NUT in an LXC container
• Troubleshooting eventual disconnections (Data stale) and CyberPower Systems (CPS) know-how
• NUT for Windows
• NUT HCL and DDL
• Code contributions, PRs, PGP and DCO
• NUT CI farm

Also keep in mind the documentation links from NUT website and the FAQ in particular.