[Tian Tan Buddha, also known as the “Big Buddha”, at Ngong Ping, Lantau Island, in Hong Kong. source: https://sco.wikipedia.org/wiki/File:Buddha_lantau.jpg]
[Ganesha, source: https://commons.wikimedia.org/wiki/File:Hindu_God,Ganpathy.jpg]
The entries in these specialized encyclopedias will give you a good place to start. This will help you understand the basics about philosophical concepts like metaphysics and the fundamentals of religious and historical traditions.
Gale Virtual Reference Library -- This reference database includes numerous specialized encyclopedias. Here are some sample entries: