What are some marriage rituals, details, or ideas that seem to repeat in many cultures?

I’m writing a book that will be the first in a canon of novels (hopefully) and as it is a fantasy series, I’ve decided to essentially create my own species for the books. One of the focuses for this species is their cultural differences inside them and humans (they are a humanoid species) and the differences between different groups of them that live in different places. Right now, I’m working on writing about marriage. Obviously, each wedding ritual wouldn’t be the same, as there are many differences among human wedding rituals, but I figured, since there seem to be some similarities among human cultures, there would be some similarities among the weddings of this new species as well. Can you help me compile an approximate list of similar marriage and wedding rituals?