Reddit mentions of The Baha'i Faith: A Beginner's Guide (Beginner's Guides)

To be honest, if you're interested in learning about the Baha'i Faith in broad terms, the best way to begin would be with an introductory book. The classic of this genre is Esslemont's Baha'u'llah and the New Era; other good books include those by Smith, Momen, and Bowers (this last one is targeted specifically to a Christian audience).

Of the books you mentioned, The Hidden Words is probably the most accessible (and shortest!), and it's usually what I recommend to people who are interested in the Baha'i Faith. However, it's not always useful to look at the Baha'i Faith through the same lens as we may look at, say, Christianity or Islam, as having one or two "Holy books" that are central to all understanding. The Baha'i Faith is blessed with having many pieces of writing from the central figures of the Faith, and it's not possible to gain a full picture of the religion just by reading the four texts you mentioned.

Edit to add: The other excellent way to learn about the Baha'i Faith, which I heartily recommend, is to meet with some Baha'is from your area and talk with them. There are (relatively) a lot of Baha'is in Ontario (although I don't know where you are specifically), and there are usually ways to go about contacting them via the web.