The primary source of investigation are Swedish parish registers.

This church registers are Husförhörslängd, Födelseböcker/Dopböcker, Dödsböcker and  Lysningsböcker/ Vigselböcker

What is that?
 
To keep track of the parishioners' knowledge of religion, the parish priest made lists of all persons in the parish, household by household, in The Husförhörslängderna, or translated into English: Household Examination Rolls,  Clerical surveys.
The year they start are very varying in different parts of the country. In some dioceses we will find many clerical surveys from the 1600s, other generally start around 1800.
These records were kept continously, in big books, every volume covering mostly a period of five to ten years.
 
What is a parish?
 
A parish is a geographical area. All people in the same parish went to the same church, were registered in the same books, and were buried in the same churchyard.
 
In  Husförhörslängden you`ll find names of all family members, birth dates and place (or at least the years). Sometimes notes if they had moved, marriage dates, deathdate, their knowledge about the religion and sometime quite interesting notes. The priest could write personal notes about the persons.
 
 The register of all births and christenings in a parish, Födelseböcker and Dopböcker, give informations about birthdate, christening date, child`s name and the parents name. Where they lived, name of farm, and names of the witnesses of the christening.

 
The records of death and burial are Dödsböcker and sometime named Begravningsböcker. Usual notes are the name of the deceased, the date of death and burial, where the person lived. Sometimes even the cause of death.
 
The marriage records are Lysningsböckerna and Vigselböckerna. These registers contain the date of the banns ( the priest tell the congregation about the forthcoming marriage), the mariage date and  names of the couple. Where they lived and sometimes even their age, their parents names.
 
 
 
 
 
 
 
 
Read more:
 
 
 So, you have Swedish roots
 Swedish Legal Records
 Tax records
 Swedish  history
 Swedish language
 Emigrant Traffic
 Swedish name