There is no one-size-fits-all answer to this question, as the number of hashtags you should use on Instagram can vary based on your content and audience. However, Instagram allows up to 30 hashtags per post, and using 3 to 5 hashtags has been shown to generate the most engagement. It's important to use relevant and specific hashtags that are popular within your industry and that your target audience is likely to search for. Additionally, you can use a mix of general and niche hashtags to reach a broader audience while targeting specific users.