This video by Kurzgesagt is pretty interesting. A word of warning; it’s funded by Templeton, which I know will bother some of you, but I found the content to be reasonably solid from a scientific perspective.
The only real issues I might have are the mysterian overtones at the beginning, and the assertion that consciousness and intelligence are different things, although that second issue might be ameliorated in the next video in the series.
I tend to think of consciousness as a type of intelligence, or more accurately a collection of intelligence capabilities. Strictly speaking that does make them different, although I’m not sure this is the difference Kurzgesagt has in mind.
I do very much like the way the video describes consciousness as a series of increasingly sophisticated capabilities. There is no bright line between conscious and non-conscious systems, just points where various people will interpret the system as either conscious or pre-conscious, depending on which definition of “consciousness” they prefer.
Consciousness remains in the eye of the beholder.