Using these chairs is a breeze. Since no assembly is required, you can simply take them out of the box and start using them right away. Place them indoors or outdoors according to your needs. The fixed floor glides will protect your indoor floors from scratches. When it comes to stacking, you can stack up to 5 chairs high, but make sure to do it carefully to avoid any accidents. As for maintenance, just wipe them clean with a damp cloth regularly. These chairs are fade-resistant and the metal frames won't rust, but it's still a good idea to keep them away from harsh weather conditions for long periods if possible. Also, don't exceed the 400 LBS static weight capacity to ensure the chairs' longevity.