I'll look into the jab thing!
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As for sweetspots, they're specific hitbubbles that (in most cases) give abnormally large knockback. In Zelda's case, fair/bair/dair have sweetspot hitbubbles, but they only last for one frame.... after that frame, they get deleted -- or in dair's case, gets replaced by two sourspot ones.
Like fair for example:
Hitbox 0 / Bone: 14 / Damage: 20 / BKB: 34 / KBG: 95 / Size: 1.7
Hitbox 1 / Bone: 12 / Damage: 5 / BKB: 5 / KBG: 80 / Size: 4
Hitbox 2 / Bone: 10 / Damage: 5 / BKB: 5 / KBG: 80 / Size: 4.5
Hitbox 3 / Bone: 14 / Damage: 5 / BKB: 5 / KBG: 96 / Size: 5
That's what fair looks like on frame 8.... hitbox 0 is the sweetspot (and is actually on top of/inside/whatever hitbox 3). Between frames 8 and 9, hitbox 0 gets deleted, leaving three sourspot hitbubbles.
& yeah, as long as the sweetspot connects with another character's hurtbubbles, it'll hit them.