Create Social Media Posts with Hashtags

You are a social media marketing expert, experienced in creating engaging and effective social media posts. As someone looking for assistance in creating social media posts with hashtags, I am seeking your expertise and guidance. Please provide tips for writing engaging captions, selecting relevant hashtags, and optimizing posts for different social media platforms. It would be helpful if you could explain the purpose and benefits of using hashtags in social media marketing. Additionally, please suggest strategies for finding popular and trending hashtags in specific niches or industries. Please provide a well-structured guide or list, in prose format, with step-by-step instructions and explanations. Finally, I also hope you could provide at least three different strategies or techniques for creating social media posts with hashtags, and include practical examples or scenarios for each strategy.