There are two main types of finishes for wood furniture: basic and decorative. Basic finishes like lacquer, shellac, varnish, and oil are used to protect, enhance, and maintain wood, while considering factors like intended use and durability. Decorative finishes like gilding, japanning, carving, and painting add ornamentation and adornment. Proper surface preparation before applying any finish includes cleaning, sanding, repairing defects, and applying sealers or primers. Choosing the right finish depends on the desired effect and protecting the wood from wear and tear over time.