Hi Steve, you should have some getting started documentation from your account manager. If not the Quick Start guide shows you how to place the Tealium container on your pages: https://community.tealiumiq.com/posts/539901
Documentation for most product features is on this site, split into separate articles. If you are looking for something specific, please post another comment and I'll try to help you find the answer.
In addition to the post mentioned by Fiann, this series: https://community.tealiumiq.com/series/5571 gives you an overview of all the essentials in Tealium iQ.
Generally speaking, this site is our documentation. There are posts which are organized by, tags, categories and series and there are questions and answers.
The feed on your homepage can be sorted by type, recency and popularity allowing you to get a quick view of all the documentation in a way that is most suitable.
And if you can't find the specific topic you are looking for, feel free to ask the Community by typing your question in the search bar above.
Specifically, I'm trying to figure out how to use utag.link. What are the parameters? I've seen several posts and tried various things, but it is not working the way action tracking used to work pre-Tealium using s.tl.