Hmm...
The tutorials might seem hard to understand at first, maybe trying to get help via the Hive Chat could prove to be a better alternative.
After all, that's how I learnt JASS, from some kind members who were willing to teach me, so yeah, I'm sure they'll explain it to you as well
If you have NewGenWE, I don't think you'll need JassCraft anymore...
That's why I said if you have NewGen... I believe NewGen won't work if you don't have wc3 installed...
and newgen also has a list of jass natives/constants...
that's a matter of opinion, you like using both, I like using only JNGP... and its totally fine, its our own preferences... haha...