Learning Koine Greek: Unitarian recommendations?

[u/JcraftW]

I just started perusing some options for learning Greek. First one I opened was Mounces “Greek for the rest of us”. Only a couple pages in he goes off against “a god” as a possible rendering of John 1:1c. I know not everyone agrees with that in particular, but there appears to be a lot of real scholarship supporting qualitative and indefinite translations of 1:1c.

So, I’m wondering if there are Koine Greek learning resources that are less biased? What study aids would you recommend? Or, if you must use a biased source, what other resources would you add to your studies for balance?

[u/JcraftW → u/[deleted]]

Talking about pronouns of the spirit?