Habbo has a secure trading system, you can trade items without fear of them being stolen.
To trade with another Habbo just click on them and a 'trade' button will appear under their name on the bottom right hand side of the Habbo window. If you click the 'trade' button a window will pop-up and you can drag the item you wish to trade from your hand to the window. When you are happy with the trade tick the box.
You can only trade on the Trading Floor in Habbo Hotel, part of the guest room area.
No, trading is optional. If anyone is trying to force you to trade with them you should send a 'call for help' and report them to an on duty Hobba, then leave the room.
Habbos will often claim they can double your furni if you trade it to them, this is a lie and they are trying to steal your furni. If someone tries this then you should send a 'call for help' and report them to an on duty Moderator, then leave the room.
No they are trying to steal your furni, you should send a 'call for help' and report them to an on duty Moderator, then leave the room.
There is no guide to what items of furni are worth, they are worth whatever you are willing to accept or pay for them.
No, you can only trade in guest rooms that are on the Trading floor.