By knowing how to delete an Instagram post, you essentially make sure that your Instagram post is permanently erased from the records of your profile and is hence rendered irretrievable; archiving, on the other hand, is a much safer option since you can retain access to your Instagram post while keeping it hidden from the public eyes and your followers.
Although, with the arrival of the Recently Deleted feature, the distinction between deleting an Instagram post and archiving it has blurred by quite a bit. Even then, archiving an Instagram post can be a much safer option since you are still given a time limit of 30 days for the Recently Deleted feature.
If you intend to retain access to your Instagram posts, archiving them can be the wise option. But if you intend to permanently delete your Instagram post and make its restoration void by either your hands or from outside, then knowing how to delete Instagram post is the option for you.
And with this, you now know between deleting or archiving your Instagram post. What you do will depend on your needs.