This is the source code for 2nd generation of Trezor called Trezor model T.
It runs both inside of the device and also in the Trezor Emulator.
The documentation can be found in the docs folder. See SUMMARY.md for a list of topics.
The documentation is also automatically built into a HTML format using mdBook and deployed to https://docs.trezor.io, where you can read it in a well arranged way.