It would have been better if you just learned how to use the search button, this question has been asked plenty of times before all over the forum not just this section.
The recommendations above will likely suit you, though. Just beware of impersonators.
Do not trust efforts to appear to provide security. Things like escrow and other "security" mechanisms are not any stronger than the people that provide thing, and those are total strangers, just like the people that they are protecting you from. Do trust in the system that is provided. Satoshi created a blockchain and system that provided a method to confirm TX's. Anyone that is trying to alter that system is trying to destroy the security that is within the system.