Hidden or Lesser Known Tips and Tricks for ESO!

Considering how many new players are here at the moment, I thought this would be a great thread for us to share our tips and tricks that are perhaps not that obvious or well known, especially to newer players, and perhaps some older players too that may have missed it! So please share anything like this to help! Here are mine:

• Adding notes to friends list and block list. You can add dates so you know when you added them, or where you know them from, same for block list, including a reason why you blocked them.
• Change your default name preference to Account Name! The reason I would recommend this is to allow you to get to know your guildies and friends better. You might not recognise the people you play with if they log in on a different character all the time. Many people think they are talking to a new person, when actually its just a different character.
• Bind a key to hide UI for screenshots. It is in the control settings, you just have to bind a key for toggle UI.
• You can reset a trial or dungeon instance without disbanding the whole group. The leader just ports out, changes the difficulty once and then back to what it was, this will automatically kick everyone still in the trial, and then you can port into a brand new instance, and then everyone can just follow you.
• Choose custom colours for your guilds to tell them apart. It will make them more memorable and characteristic.
• You can receive mail once per zone instantly. For example if you port somewhere, buy something from a trader, you can open your mail and it should instantly arrive. Assuming you haven't already opened the mail interface in that zone. After that, you will need to wait a bit longer or port to a new zone or area (such as outlaws refuge) to get it to appear.
• You can travel to any zone for free by just finding someone in your friends or guild list and travelling to them, even ones you haven't discovered yet.
• Quickslot almost anything! Mementos, banker, merchant, hide helmet, pets and skins, not just your potions and food!