Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
The group stage of the 2005 CAF Champions League was played from 26 June to 11 September 2005. A total of eight teams competed in the group stage, the group winners and runners-up advance to the Knockout stage playing semifinal rounds before the final.
Format
In the group stage, each group was played on a home-and-away round-robin basis. The winners and the runners-up of each group advanced to the Knockout stage.
Groups
Key to colours in group tables
Group winners and runners-up advance to the Knockout stage