There's no hard limit. Each of your monsters can attack once unless they've got effects that let them declare more, however as long as you can keep replacing your monsters with new ones without ending the battle phase, these can all declare attacks too.
Only if it has an effect that lets it attack more than once per turn, like Asura Priest does.
Not inherently, no, they get one single attack like most monsters. They can only attack twice if an effect is letting them do so.
It lasts every end phase.
Your opponent will be able to destroy one of your Crystal Beast Amber Mammoths in battle even if two or more are on the field. If you redirect a attack to an Amber Mammoth, the conditions to activate another Amber Mammoth's effect would be gone because your opponent finished declaring an attack against a Crystal Beast Monster you control.
The Dark Door
Only if it has an effect that lets it attack more than once per turn, like Asura Priest does.
In a sense, yes. You attack once per monster. But if one of those monsters was just summoned that same turn, then you cannot attack with it due to summoning sickness which lasts for one turn after summon.
yes but the damage from the first attack doesnt add on to the second attack
Not inherently, no, they get one single attack like most monsters. They can only attack twice if an effect is letting them do so.
A pawn can only move forward one square per turn(twice when it is being moved for the first time), but they attack dioganally(only one space diagonally though).
well there are a few but mostly its monsters effects that let you attack twice for example:elemental hero wildege and ultimate tyrano"Double Attack" is one spell card that does it.
Yes, double strike allows a creature to deal damage twice in one combat phase - once during the first strike combat damage step and again during the regular combat damage step. This means it can hit a player twice in one attack.
Medomai the Ageless's ability to attack twice in one combat phase due to its double strike makes it more powerful in gameplay by allowing it to deal damage twice in a single turn, potentially taking out multiple opponents or creatures in one go. This ability increases its overall effectiveness in battles and makes it a formidable threat on the battlefield.
It lasts every end phase.
Yes, it can.
You can attack with a monster and then tribute it in the same turn, yes. Obviously if you tribute it first, then it can't attack unless you've got a way to bring it back to the field.
No, it's not true. You get only one 'Normal Summon' per turn, but not only can other cards 'Special Summon' one or more monsters in the same turn as you do this, but other cards can let you Normal Summon more than once too.