The Forest Stewardship Council (FSC) certification is a big one. The Sustainable Forestry Initiative (FSI) certification is another, though you wouldn't need both. One of the best ways to enter the field is to look into the American Tree Farm System (ATF) which also has a certification and can help you with the others. Check your state, county, and city to see if they offer any benefits for getting your certification too. In some areas, a woodland property owner will receive a discount on their property taxes if their woodlands are certified.