Who these are written for
For the person doing the organising, not for someone reading about organising. Every article starts from a question you ask once in your life and nobody answers properly: how to word an invitation when the couple are already parents, what to do about the guests who never reply, how many seats to leave spare so the plan survives the morning of the wedding. They are long because the short answer already exists on ten other sites and helps nobody.
What is in each one
Wording you can copy, not principles. The wording guides carry dozens of ready-written lines, grouped by the parts an invitation actually has — who is hosting, the request, the ceremony, the reception, the closing — with a note on which situation each one suits. The rest carry the messages that usually go missing: the one that asks for a reply, the one that chases it without nagging, and the one a guest can use to decline gracefully. Written by the team that builds the product, and corrected when reality disagrees with them.