With global lock-downs in place, a lot of people are taking to online teaching, or live streaming and video conferencing for other reasons. This was a live stream to introduce the OBS live streaming software, which can be used for online teaching as well as other streaming and live conferencing. Everything used in this live stream is open source (and therefore free in all senses). At the end of the live stream (and subsequent video) you will be able to use OBS for basic live streaming.
Please note that this is a live stream, and it is best to skip past the wait time at the beginning.