First, do not be in awe of old registers written in Latin. There are only a few words to learn to recognise! Something that looks like "baptise" is baptise, something that looks like "matrimony" is a marriage, and something that looks like "mortus" is a burial. “Gemini” is twins.

Baptisms

Marriages

Burials

Any word that looks like mortuary or obituary!

General

So you see that when transcribing registers into a baptism database, we are just looking for key words such as "filia" (daughter) or "filius" (son), "baptizavi" plus the names. Don't worry about the L

atin grammar of names with "es" and "is" endings. You will recognise the names anyway. For example: "Baptizi Johannes filius Johannis et Joanna Smith". "I have baptized John son of John and Joan Smith".

Marriages have two surnames, and the word "matrimonium" or "nupsit" (married).
Watch out for "parochia" (parish) with a different place name ("John Smith of the parish of Littledean")

Burials have "sepultavi" or "mortus".

And bear in mind that a great number of clergymen didn't really understand Latin that well either, so they made mistakes. And when in doubt, wrote it in English and made it look like Latin !

If you want to refer to a really excellent booklet on Latin, look no further than
"Simple Latin for Family Historians" by Eve McLaughlin.