Every developer has been there: you push a commit, CI fails, and it turns out there was a linting error, a forgotten debug statement, or a test that nobody ran. Pre-commit hooks are the safety net that catches these problems before they ever leave your machine. They are not a complex feature or an advanced Git topic. They are just scripts, and once you understand how they work, you will find yourself reaching for them on every project.
The HC-05 is one of the most popular Bluetooth modules in the Arduino ecosystem, and for good reason. It's affordable, well documented, and flexible enough to handle a wide range of use cases. It can operate as both a master and a slave device, meaning it can initiate connections to other Bluetooth devices as well as wait for them. For projects where you just need a phone to talk to an Arduino, that distinction doesn't matter much. But for anything more involved, like two Arduino boards communicating wirelessly, the HC-05 is the right tool for the job.
