What sample rate should I record at?

44.1kHz for music headed to streaming, 48kHz for anything touching video — and then stop thinking about it. Both capture the full audible band. Higher rates (96/192kHz) double or quadruple file size and CPU for benefits that live outside human hearing, with two narrow exceptions: slightly lower converter latency and headroom for extreme pitch-down sound design. Consistency across a project matters more than the number.