For issues you find with the Switch and Console releases, please follow this link and give as much detail as possible. This is the speediest way to get info to Pipeworks and get a hotfix in the works.
1.4 will bring many changes to the PC version. We strongly advise making plans to back up your worlds and players prior to updating your game. More details here.
Begin your search for Journey's End information here and here. Please report bugs and issues for Journey's End here.
For issues you find with the Mobile 1.3 update, please follow this link and give as much detail as possible. This is the speediest way to get info to DR Studios to look at your issue. Also, some troubleshooting hints here.
Trading Terraria items is for entertainment purposes only; there is no real value to them. An item that someone grinded an hour for is no more 'valuable' than the same item obtained in the manner the seller describes.
If you don't want to trade your easily-obtainable gold coins for what the seller is offering, then move on to another trading thread.