Your post introduction should set the scene for your post. It needs to grab the reader’s attention and it also needs to make it clear that they’re in the right place for the information (or entertainment) they’re seeking.
Your post’s main body is the bulk of the post. It needs to be structured so that your reader doesn’t feel lost part-way through and it also needs to deliver on the promise of your title and introduction. Your main body may well take up 80% or more of your post’s word count.
Finally, your conclusion needs to draw your post to a close. You might recap your main point, share key takeaways, or end on a positive, encouraging note. You can also use the conclusion to add a call to action, encouraging the reader to check out a product, read another post, leave a comment, or anything else that you’d like them to do next.