The Matter standard will important for the connected home. So, I want to understand the technical details.
A relatively active Github project is here: https://github.com/project-chip/connectedhomeip but where is the summary document/standard to help explain the code? It seems like the code must be written to some specification.
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Check this guide: https://developers.home.google.com/matter
Or maybe even better this one: https://developers.home.google.com/samples/matter-app
Regarding the specification itself, I think you must be a CSA member to access it.
Matter is still new and many onboarding materials are still under active development. The best place you can start from will be the example projects under connectedhomeip. For example, you can take a look at lighting app.
Once you get the right development board from one of those manufacturers, click on the corresponding project from the list and follow the instructions.