To exchange assets with someone, create a trade. This will let you both place a number of assets in the trade and then agree to accept the trade before the assets are exchanged. If you don't like the trade, you can decide to cancel it. The process is secure and protects you from scamming, you should always use this option when exchanging assets.

If you don't complete or cancel your trade within an hour, it's automatically cancelled.

If you just want to send an asset to someone without expecting anything in return, use the "Send Gift" option. This sends the asset straight to your recipient without them needing to accept. Note that if the user has disabled the "Automatically accept gifts" setting, a Gift Request will be opened instead, requiring them to accept the gift.

DO NOT use this option with the expectation of receiving something in return, that's what the main two-way trade function is for. Scamming is not against the rules.

When someone sends you a gift, they will receive an error if one of your receiving trade limits has been reached. You might want to protect your trade limit, either from people testing to see if you've reached it (in the case of bullets) or from people wasting it (in the case of drug gifts). To protect your trade limit, change the "Automatically accept gifts" setting on the Settings screen, which is in the top right menu on mobile or at the bottom of the main menu on desktop. When this setting is disabled, gifts will be opened as Gift Requests instead, which is a form of one-way trade requiring you to accept the gift manually.

Trade limits apply when using the Trade Center, you can read more about them here.