Is it ok to post/Provide Bank Account details on website for online Transaction?

The best thing is not to give information on the internet. Not even on the phone. I did that once and ended up paying some lottery that did not even exist! I am still waiting on what will happen next seeing as I got the money back from the bank. They had told me I won 400 euro's and I gave them the bank information. I will never do this again!!! Stupid me!!! So, i am very careful now about these things. I am sure there are exceptions and trustworthy things, but always be careful. So, it depends why you are transferring. By the way if it is one of these emails that says you have gotten money , don't react. They ask all your information. Mostly this comes from Africa. Nigeria if I am not mistaken. They claim you get money, lots of money, but it is not true. Be careful.