Using a capture card to stream Switch gameplay to platforms like Twitch or YouTube is straightforward. Connect the capture card to your Switch dock: plug the HDMI cable from the dock’s HDMI OUT into the capture card’s HDMI IN. Connect the capture card to your PC/laptop via USB-C, and use another HDMI cable to link the capture card’s HDMI OUT to your TV (for monitoring). Install streaming software like OBS Studio or Streamlabs on your PC—add the capture card as a video source. Set up your stream settings: resolution (1080p), frame rate (60fps), and bitrate (5-8Mbps for 1080p). Link your Twitch/YouTube account to the software, then click 'Start Streaming'. For handheld mode, use a portable capture card that connects directly to the Switch’s USB-C port.