A hashtag is a word or phrase preceded by a hash symbol (#) and used to identify messages on a specific topic. Here are a few rules for using hashtags: Keep it short and simple: Long hashtags can be difficult to remember and may be truncated on some platforms. Use relevant hashtags: Choose hashtags that are related to the topic of your message. Don't overdo it: Using too many hashtags in a single message can come across as spammy. Be mindful of your audience: Some hashtags may be associated with certain groups or may have a specific meaning. Be sure to use hashtags appropriately and consider who might see your message. Don't include spaces or punctuation: Hashtags should be one word or phrase without any spaces or punctuation. Use capital letters to improve readability: If your hashtag includes multiple words, you can use capital letters to make it easier to read. For example, #NationalCoffeeDay is easier to read than #nationalcoffeeday. Use hashtags to join conversations: Hashtags are often used to follow or join conversations on a specific topic. Search for relevant hashtags to find and join relevant conversations.