Does necromancers undead minions heal on short and long rests, like a character?

Are material components always consumed upon casting?

If invisibile, whats the rules for melee targeting & spells?

Does a fighter with an increased crit range (say 19-20) always hit on a 19?

The focus/component/free hand distinctions are difficult to tease out

Was it intended for Eldritch Blast as one attack with multiple attack rolls and thus to activate Hex only once?

Can you jump farther than your movement when using Jump & Boots of Striding and Springing?