1. No idea
2. molten metal
3. No idea
4. plot armor
IN LEGENDS AS IN REAL STAR WARS
1: An alternate plain of existence/ dimension
2: Rate of Movement or Distance between objects is different than real space depending on the source. Some sources also state that in hyperspace the concept of space time is so intrinsically warped that the distances are more or less folded over, or twisted by moving objects. There is no one correct answer because every source book says something different. ; )
Bonus: NONE
3: Molten Metal - unless it is completely vaporized which is not uncommon especially if the Jedi is using kyber amplification.
4: Quantum Crystalline Armor (If you say anything else you are dum unless you say Luke's skin when he is using some broke force power... and then you are still dum.)
*Extra* other stronger-than-beskar materials in legends include: Darth Bane's Dark Side Parasite armor and Yuheez Vong Crab armor (is more flexible, and as such can be called stronger)
Canon Answer :_(
1: a higher dimension
2: thanks to the nature of higher dimensions, real space is wrapped around hyperspace, allowing ships to short cut along the smallest tangent of the sphere comprised of several dimensional levels, with real space being the surface. Hence the longest a hyperspace path can be is the dimensional diameter of the galactic extra dimensional sphere. This is why all hyperspace distances are so similar, because most tangents of a sphere are within a relatively small range compared to a galactic plane.
Bonus: N/A
3: In canon comics slugs act as they do in legends, and I don't think slugs have shown up in any other canon format. Obi Wan is seen blocking slugs in canon though. He is still hit by the molten metal.
4: Probably Beskar (or in DISNEY CANON *inserts barf emoji* cortosis)
Hyper space allows faster than light travel by_________ where the ___ of _____ aren't the same
when a slug thrower is shot at a saber it spews off into_________ still flying towards the poor jedi
Question: how many midis did Anakin lose when he got sliced and diced
The strongest material in star wars is ______ _____