You do not need to trust anyone. In a conventional banking system, you have to trust everyone who manages your money here is the bank. You may have to rely on a third-party payment processor. You will often have to trust the person dealing with you. And they all ask for important information from you. Because Bitcoin is completely decentralized, you do not need to trust anyone. When you do a transaction, it's a type of digital signature, and safe. Any digger will verify, and then the transaction is completed. Traders do not even need to know who you are, unless you want to tell them.