Please help me. I am always confused when I use the noun invitation or verb invite
It is my invitation to / for the wedding.
We hereby invite you to /for the party
Of late I have come across even invite as a noun as in
Its my invite to/for the wedding
We hereby invite you to the party. But this is exceedingly formal. Hereby is a very official word you'd see in things like legal documents. Just say "We invite you to our party".
Invite is an informal way of saying invitation.
invite - definition. American English definition of invite by Macmillan Dictionary
It's also used online to refer to invitations to various sites, communities, etc. In this context you use invite but not invitation.