You can send trade requests to your friends or making a trading post. Anyone can start a trade with you via your trading post, even if they’re not your friend. However, to send a trade to a specific person outside of trading posts, you have to be that person’s friend.
If you’re not sure what a fair trade is, try asking the person you’re trading with about what kinds of things they’re looking for.
Also be careful to read over a trade before tapping “accept”! Once executed, trades cannot be undone by us. You and the person you traded with would have to agree to trade back.