Development tools 
Tools for developing and deploying Arduino programs
- Arduino IDE 2.0
- Formerly:
- Software > Arduino IDE 2.0
- Formerly:
- Arduino legacy IDEs
- Formerly:
- Using Arduino > Installation & Troubleshooting
- Formerly:
- Board detection, upload problems and bootloaders
- Formerly:
- Using Arduino > Avrdude, stk500, Bootloader issues
- Formerly:
- Web Editor
- Formerly:
- Software > Web Editor
- Formerly:
- IoT Cloud
- Formerly:
- Software > IoT Cloud
- Formerly:
- Chrome App
- Formerly:
- Software > Chrome App
- Formerly:
- Arduino command line tools
- Formerly:
- Software > Arduino command line tools
- Formerly:
Your project 
Assistance, discussion, and sharing Arduino-related projects of users
- Tutorials: A curated collection of tutorials
- Formerly:
- Using Arduino > Introductory Tutorials
- Formerly:
- Advice on your project
- Formerly:
- Using Arduino > Project Guidance
- *Projects Discussion and Showcase >
**
- Formerly:
- Problems with your project
- Formerly:
- None
- Formerly:
- Programming: Project code
- Formerly:
- Using Arduino > Programming Questions
- Development > Libraries
- Formerly:
- Showcase
- Formerly:
- Community > Exhibition / Gallery
- Formerly:
Official Hardware
:
Topics specific to official Arduino products
- Classic
: The products listed under https://docs.arduino.cc/#classic
- <A category for each "Classic" product>
- Education
: The products listed under https://docs.arduino.cc/#education
- Kits
: The products listed under https://docs.arduino.cc/#kits
- <A category for each "kits" product>
- Mega Family
: The products listed under https://docs.arduino.cc/#mega
- <A category for each "Mega" product>
- MKR Family: The products listed under https://docs.arduino.cc/#mkr-family
- Nano Family
: The products listed under https://docs.arduino.cc/#nano-family
- Nicla Family
: The products listed under https://docs.arduino.cc/#nicla-family
- Portenta Family
: The products listed under https://docs.arduino.cc/#portenta-family
- Pro Solutions and Kits: The products listed under https://docs.arduino.cc/#pro-solutions-and-kits
- <A category for each Pro Solutions product>
- Miscellaneous: Official products that don't fit into any of the other categories
- Arduino SIM
- Intel®-based platforms
- Retired: The products listed under https://docs.arduino.cc/retired/
- <all existing categories of retired products>
Other Hardware 
- Microcontrollers and 3rd party boards
- Formerly:
- Using Arduino > Microcontrollers
- Formerly:
- General Electronics
- Formerly:
- Using Arduino > General Electronics
- Formerly:
- Leds and Multiplexing
- Formerly:
- Using Arduino > Leds and Multiplexing
- Formerly:
- Displays
- Formerly:
- Using Arduino > Displays
- Formerly:
- Audio
- Formerly:
- Using Arduino > Audio
- Formerly:
- Motors, Mechanics, Power and CNC
- Formerly:
- Using Arduino > Motors, Mechanics, Power and CNC
- Formerly:
- Sensors
- Formerly:
- Using Arduino > Sensors
- Formerly:
- Networking, Protocols, and Devices
- Formerly:
- Using Arduino > Networking, Protocols, and Devices
- Formerly:
- Storage
- Formerly:
- Using Arduino > Storage
- Formerly:
Community 
- General Discussion
- Formerly:
- Community > General Discussion
- Formerly:
- Website and Forum
- Formerly:
- Community > Website and Forum
- Formerly:
- Suggestions for the Arduino Project
- Formerly:
- Development > Suggestions for the Arduino Project
- Formerly:
- Project Hub
- Groups and Events
- Formerly:
- Community > Local Groups
- Community > Workshops and Events
- Formerly:
- Bar Sport
- Formerly:
- Community > Bar Sport
- Formerly:
- Jobs and Paid Consultancy
- Formerly:
- Community > Jobs and Paid Consultancy
- Formerly:
- Products and Services
- Formerly:
- Community > Products and Services
- Formerly:
International 
- 中文 (Chinese)
- Deutsch
- Español
- Formerly:
- International > Español
- Software
- Hardware
- Microcontroladores
- Documentación
- Humor y Debate
- Talleres, Encuentros, ...
- Proyectos
- Formerly:
- Français
- Formerly:
- International > Français
- Tutoriels et cours
- Réalisations et Projets Finis
- Le bar
- Formerly:
- Italiano
- Generale
- Formerly:
- International > Italiano > Generale
- Formerly:
- Hardware
- Megatopic
- Software
- Generale
- Nederlands
- Português
- Formerly:
- International > Português
- Formerly:
- Россия - Russia
- Scandinavia
- Formerly:
- International > Scandinavia
- Formerly:
Forum 2005-2010 (read only) 
As is
I have kept the 2005-2010 as is and did not merge any of it into other categories. I can see some benefits but I also see a lot of work filtering them for the above approach.
What is still outstanding:
- Development > Other Hardware Development; reason is that it contains a collection of all kinds of things so it needs to be merged on a topic-by-topic basis for the above approach.
- Projects Discussion and Showcase > Device hacking; can probably go as a subcategory in Your Project
- Projects Discussion and Showcase > Education and Teaching; no idea about it.
I was indeed thinking of @davide_prentice (as mentioned by @6v6gt).
Thanks for that
As said, I don't ![]()