"Hidden" means that your loan offer/request is not shown in the order book.
"Count" is the number of BTC that is being offered/requested (or the number of US$ if you are looking at that order book)
@Quickseller
Thanks. I intend to try out their margin lending. Are there any limitations such as submissions of IDs for transacting a certain amount? I don't intend to touch fiat at the moment, but pure crypto.
Thank you @Quickseller for the quick responses. Will explore bitfinex further. Looking at current hashing difficulty, it is inevitable Bitcoin users will find other ways to grow their coins.