Was just told about Scrum

The definition of Scrum can be found in the Scrum Guide, which is freely available.

Scrum.org also has a long list of resources including organizing those resources by competency or by a more role-based learning path for Scrum Masters, Product Owners, software developers, or organizational leaders.

There are some good things outside of Scrum.org, too. If podcasts and/or YouTube are more your thing, my top picks are Agile for Humans, Mastering Agility, and the Scrum Master Toolbox. If you prefer reading articles, I've found Serious Scrum (website, Medium publication) to have well-written, informative, and thought-provoking articles. The Agile for Humans creators and a few of the Serious Scrum editors are also Professional Scrum Trainers, so their content is more likely to be in line with Scrum.org's interpretations and perspectives.

The one thing that I will add is that there is a lot of information out there. It is important to understand the source of that information. Not everything is consistent with the Scrum Guide or with the current version of the Scrum Guide, so it may not be helpful for learning more about Scrum.

A lot of what I am reading I do already at work

Empiricism is often what people resort to in an emergency. One of the ironies of agile practice is that once, having dug themselves out of a hole, organizations dispense with this approach and resort to the same prescriptive techniques which drove them into the ditch in the first place.