You can activate Quickplay Spell cards in your opponent's turn, if you have Set them on the field. As well as that, some of your face-up continuous and continuous-like cards may have a trigger than activates when a certain condition is met, these can activate in the opponent's turn too (Black Garden is one).
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regular spell cards can be activated only on your turn, quick play spell cards can be set then activated during your opponents or your turn, and spell cards with the infinity sign are treated like regular spell cards but stay on the field until it is destroyed traps cannot be activated from you hand they must first be set then activated on your next turn or your opponents turn knowing when to activate these spell or trap cards is tricky you have to know when to activate them or they will end up not helping you out at all
No, Normal Spell Cards like Dark Hole can only be activated on your turn during your Main Phase 1 or 2.
A best yugioh deck would be a deck that eliminates your opponents options. like a deck with jinzo and horus, the black flame dragon LV 8 both can stop your opponents spell and trap cards. also a deck with cards like needle worm can discard your opponents deck so when they have no cards left you win.
Yes, of course. Quickplay spells can be activated at most times during the battle phase and up to the end phase, the spell speed 1 ones can be activated in Main Phase 2.
Spirit Burner is a equip spell card, it may not be used during your opponents turn. Only quick play spells (indicated by a lightning bolt) may be used then.