When a creature has resistance against non-magic weapon what does it mean?

Does a weapon that has been enchanted to do count as magical to overcome resistances?

Does a weapon that has been enchanted to do (insert extra damage type) count as magical to overcome resistances?

What happen If a creature has 6 levels of exhaustion?

Are there spell restrictions on casting multiple spells in a single turn?

True strike followed by witch bolt what happens?

Mage Armor spell and Armor Bonus from Bladesinging, do they stack?