why are you learning navajo?
as the title says
I was always taught that I was Native American, and did things like finding arrowheads and/or flint shards and made baskets out of reeds. I did the Navajo course so I can learn about Native American languages, even if not my own tribe's language. Then, not too long ago, I found out that the amount I am is minuscule. I still went with it, though, because I liked the language.
Linguistically Navajo has about as much in common with Siksiká (the Blackfoot language, which is indeed an Algonquian-family language) as English has with, say, Hebrew. :)
If you're interested in learning a language a bit closer to your heritage, I recommend Ojibwe, which has a thriving Algonquian language community and is taught at a couple US universities.
Here's the online resources for Professor Valentine's Ojibwe course at UW-Madison: http://imp.lss.wisc.edu/~jrvalent/ais301/ (IIRC, it includes lots of audio samples you can download.)
Here's a wonderful online dictionary for Ojibwe created at the University of Minnesota: https://ojibwe.lib.umn.edu/ (True story: I almost left my job to work on that website a number of years ago.) :)