This obv isn't the full demo but I think lineweights are pretty stylistic and rules are arbitrary to achieve a look. Scott Robertson mentions he likes to indicate depth with lines, thicker lines for overlapping forms which I really like. For instance the brim of the witches hat might have a a thicker line as it comes closer to cam(same with the sleeve). Or when things press together the line kind of dissolves at the contact points. Definitely a good base but people should experiment a bit.

Excuse me, can I ask what brush did you use in Procreate? Can I find it in your website?

Do you have a course about line weight ?

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man I don't know... are you sure ?