There's no hard limit. As long as you've got the resources to, you can peform as many fusion summons in a single turn as you want.
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No it can not. "Cyber Dragon" + "Cyber Dragon" + "Cyber Dragon" A Fusion Summon of this card can only be conducted with the above Fusion Material Monsters. During battle between this attacking card and a Defense Position monster whose DEF is lower than the ATK of this card, inflict the difference as Battle Damage to your opponent. ^^It doesn't say it can attack 3 times.
Not quite. A Synchro Summon is a Special Summon. A Tribute Summon is the same as a Normal Summon, except that when you Tribute Summon you need to tribute monsters. Also you can Special Summon as many times as you want to in a turn, whereas you can only Normal Summon OR Tribute Summon once per turn, except with a card effect.
Only if the card's effect specifically says you can, then yes, such as monsters affected by Soul Exchange, or Chimeratech Fortress Dragon. At all other times, a tribute must be something you control. Dogma does not say you can use the opponent's monsters, so you must use your own.
If you Normal Summoned a monster in Main Phase 1, you cannot Normal Summon another monster in Main Phase 2 as both Main Phases are in the same turn and according to Konami's Master Rules, a player can only Normal Summon once per turn, unless otherwise indicated by a card effect.If you use the effect of Ultimate Offering or Double Summon, then yes, you could Normal Summon again.You can Special Summon as many times as you wish during any turn.
Yes, a Special Summon of any kind does not count towards your limit of one Normal Summon or Set per turn. You can Special Summon as many times a s you want per turn.