How exactly does coffee work?
Please see the dedicated Coffee help page Here

When can I resign?
In order to resign, you must have played at least 4 turns. After 4 turns you can resign during any restructuring phase. All other players will be allowed to restructure again to take into account the removal of a player. If players have enabled notifications in their profile, then they will receive a notificaion that it is their turn.
Resignation is now available in all games. Please note that at Online Board Gamers, players will never be penalised if they choose to resign. Sometimes it is a valid (and best!) option. This is slightly different to timing out and being kicked out of a game, which actually has no penalty at the moment, but I might add restrictions on joining games if you've been kicked out a certain number of times within a certain time period.
Note: You can also resign at the confirmation options when placing your initial restaurant. This will allow you to exit games you didn't mean to join, or have changed your mind over right away. It will still count as a loss in your statistics.

How do kickouts work?
If someone is inactive for longer than the kickout duration set during game creation, then the game will have a yellow highlight in your "Current Games" list. You can click on the game to enter it, and will then be asked if you wish to kick the player, or allow them more time. If you do kickout the player, they will keep their employees, but simply pass all of their future turns.
If someone leaves the game, the host will gain permanent rewind permissions.

What are the Expert Options?
Expert options appear in an orange panel. They are meant to allow players to automate decisions that are obvious choices to make, and thus allow games to progress a bit faster.
You can select your preference for Order Of Business during restructuring. A note is added in history as turn order is resolved if the decision was automatic. Of course, it is very possible to select "Earliest possible" and stll end up in last position - this just meant that everyone else had more open slots or an earlier turn order than you, and also chose to go early in turn order.
You can select to autopay salary even if you don't have enough money, if you do end up having enough money after dinnertime. Similarly, if you have the Beer Milestone but no fridge, you can choose to pay in as much food as possible, and then money. You also have the option of keeping all remaining food if you have a fridge and end up with less than 10 items.
Note: Even if you select an expert option, you still might end up playing that phase. For example, if you don't have enough money for salary, you will need to fire someone, and so must play the salary phase. Also, if you end up with kimchi plus other items, you will be required to play the Cleanup phase. Game rewinds and player kickouts can also result in phases needing to be played that you had selected to skip.