What is the ruling on buying and selling used original electronic games at a price much lower than their original price through a website, and is that considered an infringement of intellectual property rights? Does this rule apply to all used items? And is it necessary to verify the credibility of the website?

Copyrights are protected for their owners, and it is not permissible to infringe upon them. The reference for determining infringement and authorization is common practice. It is permissible for someone who has bought an original copy to sell it or donate it. Researching the credibility of a website is not obligatory unless there is strong suspicion.