One of the key elements is a strong conflict. It can be internal, like a character's struggle with their own conscience, or external, such as a battle against an evil force. Characters are also crucial. They need to be relatable so that readers can connect with them. Another element is the pacing. A good story should have a rhythm, not too slow that it bores the reader, nor too fast that important details are missed.
Well, it's not a straightforward comparison. Stories offer a more elaborate narrative, but posts can be more concise and focused. It really depends on your purpose and the context.
Read a lot of good stories. That'll give you an idea of what works and what doesn't. Also, practice regularly. The more you tell stories, the better you'll get.
I think it varies. Reels are fun and fast-paced, but stories can provide a more immersive and personal experience. It all depends on how you want to consume and share content.