Generally, you can only Normal Summon once per turn. However, there are some cards, such as Ultimate Offering and Double Summon that allow you to Normal Summon multiple times.
Special Summoning has no limit besides the 5-card Monster Card Zone input. You can Special Summon as many cards as possible in a single turn unless another card specifically prohibits such actions such as Summon Limit.
Ultimate Offering
TRAP/Continuous Trap
At the cost of 500 Life Points per monster, a player is allowed an extra Normal Summon or Set.
Double Summon
SPELL/Normal Spell
You can Normal Summon 1 additional time this turn. You can only gain this effect once per turn.
Summon Limit
TRAP/Continuous Trap
Neither player can Summon more than two times per turn.
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'Advance Summon' is not a TCG term, nor is 'sacrifice'. It has always been, and is still called, a 'Tribute Summon'.
A Reverse Summon is the Japanese name for what the TCG calls a Flip Summon. To Flip Summon a monster, in your main phase 1 or 2, you manually change the position of one of your monsters from being Set, into face-up Attack Position.
An 'advance summon' is the Japanese OCG term for what the English TCG calls a 'Tribute Summon'.
No, he isn't released yet or will never be released.
It is a normal summon, so you must wait another turn to activate it's ability.