You can use the hashtag symbol (#) before a relevant keyword or phrase in a kahoot description to categorize the kahoot and help it show more easily in searches. Words or phrases prefaced with a "#" are weighed more significantly than other words or phrases when a search query is aggregated. This benefits other users trying to find your content on the Public Kahoots page, as well as yourself when trying to find specific kahoots on your My Kahoots page.
Note that if using a hashtag before a phrase, the phrase needs to include no spaces. For example, if the phrase is "first grade", the hashtag should be "#firstgrade". Typing "#first grade" will cause the hashtag system to think the tag is simply "#first".
How to add tags
When creating/editing the description of your kahoot, use hashtags within the description box.