Cast yourself in a good light. Make sure you have adequate lighting. Keep the time of day in mind. You may want to use a warm soft light for your face coming from the direction of the camera.
Set your camera to record you at eye level.
Use a mic or headset, rather than the built-in mic from your computer/laptop/phone.
Practice to get comfortable with the setup and the materials you will cover.
Open Broadcast Software (OBS) - OBS Studio is free and open source software for video recording and live streaming. Currently for Linux, Mac and Windows.