Always keep lens covers closed whenever the sight is not in use, learn how to clean Aimpoint sight lenses here.
Check the battery in the sight occasionally during the years of use, to avoid leakage that can be harmful to the sight.
Aimpoint Quick Guide Videos with visual step by step handling and maintenance instructions can be seen here.
Make sure you are using a mount of high-quality if the sight you have bought is sold without mounting solutions. A poor-quality mount can affect the accuracy of your optic.
Aimpoint offers a complete line of high-quality mounts adapted for each sight. Available Aimpoint mounts for the different red dot sight models are presented on each product page and can also be found in the Product Finder using the filters: Mount and Sight Model.