More questions about Freelancer

Is it safe to share card details including CVV no. on freelancer website before getting hired for job? is freelancing is better then any other such jobs I just recently took a typing test and have a certificate letter. Do you accept that as proof of a typing test? Is there a way to upload it to you. Please return my $10.00 deposit. I sent a deposit of $10.00 to you and never used the services. How about returning my money? I hired a freelancer to help me with my project he told me 2- 3 days work...I deposited the appropriate funds and three months later the guy dissappea why they have closed my 100% verified account without any warning? I am creating tickets again and again but they are not responding to any of them? when someone hires me why they are asking to transfer some amount into their acc and after completing task they will return it back?is it fake Interested in learning more Do we have to pay to get a work in this website?