It is limited. When sites are contradicting each other, take Konami's word for it instead, see related link.
'Change of Heart' is currently forbidden in Advanced Format, and limited to 1 in Traditional Format.
Raigeki is forbidden in Advanced Format and restricted to 1 in Traditional.
Yes, you are allowed to own or get cards listed on the Forbidden List. If you are following the Advanced Format, then you are not allowed to use those cards in a duel.
It is forbidden in Advanced format, and limited to one in Traditional.
It is Limited to 1, in both Advanced and Traditional Formats.
Pot of Greed is forbidden in Advanced format and restricted to one in Traditional format.
Yes, you may use one piece of each 'Forbidden One' card in your deck, for both Advanced and Traditional format.
Chang'an Jiankang Xianyang Yinxu The Forbidden City
Birth Day - 2000 Advanced Maternal Age was released on: USA: 25 September 2000
September, 1846 was when Taylor advanced toward Monterrey.
Union General Rosecrans
There are no codes. They do not exist in games (in play) and are forbidden in advanced and traditional format dueling events. They are just for collecting and/or selling.