The major error made by most people in this thread is thinking it is possible to give a single definition of consciousness that is coherent and matches common usage. The folk concept of "consciousness" couldn't be a more clear definition of a family resemblance category, so discussions using the folk concept are an utter waste of time.

Move to the different aspects / parts / things involved when we talk about consciousness (experience / phenomenal consciousness, self-modeling, intelligence, agency, embodiment, wakefulness/alertness, attention, etc) and you can have very clear, meaningful, and unambiguous discussions on almost every point, but there is no coherent unified "consciousness" as normal people use it, and the folk concept can't be salvaged.

This article is bad because it just keeps trying to make the folk concept do work that the concept is simply too messy to handle usefully. But in fact if you avoid trying to find some mysterious essence or all-capturing definition, there is huge progress and lots of interesting stuff to say (https://plato.stanford.edu/entries/consciousness/).