When painting furniture like chairs and tables, the straight-line method usually reaps the best results. Aptly named, this technique refers to the application of bold paint strokes in one direction. This helps produce a consistent and even finish across the entire area and decreases the need for multiple layers of paint. It also lessens the likelihood of ugly roller or brush marks. The same applies when you apply your second coat - make sure you paint in the same direction as the first.
If you're painting wooden furniture, be sure to go with the grain for the best results. It's also best to use a lighter pressure and aim for long, even strokes.