Answer:
The first, third, forth, sixth, and seventh statements.
Reasoning:
In the first statement someone opens six credit cards; this number of open lines of credit is not recommend.
In the third, you are freely exchanging personal information by opening a line of credit without real reason or investigation.
In the forth, there is a high chance that the site is a scam.
In the sixth, it is generally not wise to use online banks because it can be more difficult to report issues and concerns as there is nowhere for you to go for help.
In the seventh statement, not throughly researching the credit card you wish to get is always a bad idea.