The phrase "excellent overview" means a great summary or explanation of something, providing a clear and broad understanding of the subject. Full definition
Excellent overview chapters with specifics on a wide range of conditions for infants to the elderly. (lllmarivt.org)
Also consider ANA, though roundtrip award ticket is required (see a post on Lazytravelers for excellent overview of its new -LSB-...] (lazytravelers.net)
«The Oracle of Boston»: Seth Klarman An excellent overview in the Economist of one of the investors we respect most. (londonvalueinvestor.com)