This video tutorial shows the camera configuration to enable Back Button Focus on a late model camera (cameras released after 2020 with the new menus) The movie also outlines some Pros and Cons of using a Back Button Focus workflow.
Sony Alpha photographers using older model cameras, using the older menus, can view this video: https://youtu.be/pWsF5pMri-Q
A to Z series of video series: https://youtube.com/playlist?list=PLWC-IgKORdDHmSXPi3bftJSOzO_3ypLA1&si=w6aq2shv8edB-zJJ
Download an eBook and camera setup file from Patreon.com/markgaler