This section contains some useful resources for learning about Ledger and embedded development—which is especially nuanced and requires additional considerations beyond typical crypto development.
This is by no means an exhaustive list, but aims to provide some key materials.
The Ledger Docs are by far the best place to start.
They cover anything from how a Ledger works, to publishing a Ledger Application, to secure app development.
*Be sure to read the Ledger Security Guidelines.
It covers many concerns that would typically not be obvious, and is something that should be read more than once.