What is the difference between "a" and "az"? They had: A alma = the apple and Az autò Is it a genre difference?
"Az" goes before words starting with a vowel, "a" goes before words that start with a consonant. It's like "a" and "an" in English.
You saw "A alma in the course?" That's wrong - even I know that. :) Might've been a typo.
It could. If you report it, maybe they will add it to the accepted translations.