As I touched upon briefly in Bento Basics, there are different kinds of bento box meals, and this site is primarily concerned with bento lunch boxes. Even these come in different varieties.
There are three main types of homemade bento lunches that are popular in Japan at the moment. Here I'll try to describe them, with example blogs and books from Japan. (Please note that all book links are Amazon or other associate links, which help to support Just Bento and Just Hungry.)