Any question answered...

Person shares screen with the scattegories page so everyone can see. There are different versions/rules but this is how we play (which is more similar to stop the bus, I think).

It gives you a letter and several categories, when they're revealed, everyone has to write down an answer to as many of the categories as possible that start with the nominated letter.
EG, Letter D, Category: Country, Answer: Denmark. NB, you only write down one answer per category - choosing your answer is part of the strategy as it has to be unique to score.
When a player has an answer for all the categories, they say stop and everyone must stop writing, or you stop when the time runs out. The person who said stop then goes through their answers to check for validity - you can then discuss if the answers are all accepted . If any are deemed unacceptable, the round continues until the someone completes the full set of categories, which could be the original "stopper" if they think of a new answer, but this is uncommon as debatable answers are usually the result of a hard category/letter combo. You then check with the rest of the players answers (goes quicker than it sounds).

You get a point for each unique answer. So if two people both have the same answer, neither get a point. You get double points for a double barrel eg Category: Band, Letter: F, Answer: Franz Ferdinand.

The way we play it, the categories stay the same, and you just re-roll the letter choice. But on the website, you can have all new categories and a letter each round.

Hope that makes sense. Honestly, it's super easy for people to pick up, engaging and generally a good laugh, but most importantly it's very zoom friendly.