This Bitwig tutorial walks through the audio setup section of the dashboard, covering how to select your input and output devices, set your sample rate, and configure your block size before recording. One underrated feature shown here is Bitwig's ability to use separate devices for input and output, which comes in handy when your main interface doesn't have enough inputs for all your hardware.
The block size setting gets the most attention, and for good reason. Lowering it reduces latency, which matters when you're capturing a live performance, but it also puts more demand on your CPU. Starting at 128 samples is a reasonable default for most recording sessions, with the understanding that you may need to push it higher as your project grows.
The bit also briefly covers input bus labeling, showing how to rename inputs so they show up clearly on your tracks inside Bitwig.