Go to https://www.meteor.com/ and Start tutorial. After installed you can go through the tutorial in an hour or two depending how deep you go, and it comes with a number of examples (show with "meteor create --list").

Discover Meteor has some more; they were giving their book away (see https://www.discovermeteor.com/blog/we-made-our-book-free/ -- first 4 chapters are free).

That may be enough for the basics. Then look at telescope, or one of the chat apps listed here or search on github. Also plenty of conference talks on youtube.