The trading feature offers completely safe trading. Initiate a trade with /trade <player>. When the other player accepts the trade, (by writing /tradeaccept <player> or clicking [Accept] in the chat prompt), a GUI menu will appear for both players. Each player has their own side, and will put the amount of money, or items that they want to trade. Once you are both satisfied with the trade, you will both switch your statuses to “Ready”, and the trade will take place. Of course you can always cancel the trade by exiting the menu.