Vital Records include birth, marriage, divorce and death records.
Bounty Land is public land given by the government to induce young men to join the military. Applicable for soldiers prior to the Civil War.
Christine Rose and Kay Germain Ingalls, The Complete Idiot’s Guide to Genealogy offers many suggestions on Courthouse research.
Be sure to look at several families before and after the family you are researching. These people are most likely the friends or family of your ancestor. Many lived in the same community very near each other.
Set up "proof files." These are your original documents that NEVER travel with you. Travel with copies if needed. Digital copies are easy to carry with you.