Here are the slides I used for my sharing on hashtags in Twitter. Essentially, hashtags allows us to quickly search for tweets we want to find. If our tweets belong to a certain category, for example if it is related to the use if technology in education, then we should include a hashtag, in this case it would be #edtech, so that other users can easily find similar tweets under the same category.
Please do let me know if you find hashtags that are useful and related to education.
Have fun tweeting!!