I'd like to learn Hebrew, and my understanding is that the OT vocabulary is very limited, though creative word use, particularly in Hebrew poetry is a challenge to understand.

I don't know enough about the distinctions between Ancient and modern Hebrew to be certain, but I believe they are significant enough that Duolingo won't be a good fit, particularly as definitions of words in ancient Hebrew aren't always agreed upon.

Are there any recommendations? I have the Biblia Hebraica Stuttgartensia and a couple other books, since I thought they would be good references, but a lot of the word formations are dependent on pronunciation, and reading descriptions of how to pronounce words isn't doing it for me.