Love this question! BOTH ANSWERS ARE CORRECT! I know it’s confusing but my father went for the “least amount of changes” to explain this scale but it’s confusing because he takes a MAJOR scale to explain how to get to a MINOR scale. The other requires an additional step but since the starting point is minor(aeolian), it’s a touch less confusing to some people. I believe my father was also trying to highlight that melodic minor has characteristics of “major” at the end which is very important to understand.
All you have to know, is the scale itself. Know how to play it, know what to play it over, and know it by chords(triads and extensions from each degree of the scale).
I would bet a lot of money that all of the aforementioned is quite confusing but here’s the great news…..the community can help!
I’ve given an outline, now ask particular questions and don’t stop until you get it.
Also, basic studies to merely understand this immensely deep combination of intervals(melodic minor scale) can add up to years so PLEASE PLEASE PLEASE, be patient and ENJOY THE PROCESS!