Day, time, place... The date is really important and don't be mistaken - just because you announced it 5 times doesn't mean it won't be worth it after 6.
Daily schedule
When and where does the wedding start? What is the approximate schedule? When will there be more traffic and when can the drivers drink? You don't need to have a minute-by-minute schedule, but an outline of the program is helpful.
Gift list
An optional item, however, it is essentially standard and even if the form may seem a little strange romania phone number data to you, know that it is better to have a form than to receive 4 sets of dishes...
Form
If the website allows you to add a form – ideally with a simple connection to a Google spreadsheet, that's great, you can use it for:
confirmation of participation,
determining interest in accommodation,
determining interest in individual menus,
various special requirements (someone is vegan, can't eat gluten, has no way to get there, etc.)
The story of you two
There's probably no need to exaggerate, but a few words about how you met, how the proposal went, and the like... will definitely please all the aunts.
A message to the band, photographer, florist, venue...
This is not mandatory and in the end it doesn't really matter. However, if you mention at the time of the appointment that you will list the band/florist/catering on the website, it may please them and if they are busy, you may even increase the chance that they will make time for you.