Vital Records include birth, marriage, divorce and death records.
Use a good genealogical software package to maintain your records and your digital files.
When doing research in probate records, request to see the entire file.
Newspapers are wonderful hometown records. In addition to looking for obituaries, be sure to look for articles about special events... births, baptisms/christenings, weddings and pre-nuptial events (bridal showers, etc.), birthdays (parties), anniversaries, etc.
Women were included under their husbands' naturalization until 1920. However, due to the Expatriation Act of 1907, a women lost her citizenship if she married a person from another country that had not already been naturalized.