A marriage certificate states the date of marriage and the first and last names of the marriage partners and witnesses. Most deeds also mention the names of the parents. Sometimes the place they came from, their age or date of birth are mentioned. In the 16th century, betrothals were also carefully recorded. If the bride or groom were widows or widowers or if they were (from afar) related to each other, this is usually also mentioned in the deed.
When looking up, always remember the different variations in the spelling of surnames. Also bear in mind that in some parishes the registers have been lost or have not yet been completely transferred to the database.
If necessary, use your browser's search function to find your surname in these large files. The number of records per surname can be found in the first column.