Answering the most common questions about learning Arabic

I've been chipping away at Arabic for years, and I recently sat down with Hasan Alhamwi, the founder of Arabic All The Time. He left a career in civil engineering to build the largest library of Arabic comprehensible input on the internet. We talked about why videos beat textbooks for Arabic, when learners should finally start reading, and whether all those dialects are really one language or many. If you're learning Arabic, what's giving you the most trouble?