Hashtags are words that follow the specific symbol (#) that help describe your content. This is helpful for both your users to discover content and Instagram to help understand what you post, to show it to more people on the platform.
Using the right hashtags can mean the difference between nobody seeing your content and your post going viral.
Hashtags are also valuable when using Creator Campaigns. For more information, see the dedicated support article.
There are limitations regarding the number of hashtags you can use in a specific period. Facebook imposes a limit of maximum 30 hashtags/week that can be tracked at the same time. You can use your existing hashtags, without increasing your limit.
See all of the Content support articles in their dedicated section.