Does the website invitation have to match the printed card?
On the facts, yes: names, dates, venues and dress code should read the same on both. Tone can differ, and the page can hold far more. Crucially, only the page can be updated when something changes, so point guests there for anything time-sensitive.
Where on the page should the RSVP live?
Within the first screen or two, and again at the end of the details. On a phone, an invitation whose reply button lives somewhere further down becomes a task for later, and later quietly never happens. Put the deadline beside the button.
Can we keep the invitation page private?
Yes. The whole site can be password-protected, and you share the password in the invitation message. Useful when the link will travel through group chats wider than your actual guest list.
Should we publish the schedule before every time is confirmed?
Publish what is firm and be honest about the rest: drinks around five is enough until the band is booked, then you edit once. Guests trust a page that corrects itself; a page that contradicts the card is what erodes trust.
Is a separate FAQ section really necessary?
Once you have answered the same question twice, yes. Parking, children, arrival times, the rain plan. Written answers stop the group chat from becoming the wedding's second website, and they let you sleep on the day the details changed.