This video has a page on 0DE5 with exercises and resources
https://www.0de5.net/stimuli/a-reintr...

Link to the really great hex editor I used: http://imhex.werwolv.net

Chapters
00:00 - Intro
02:00 - Endianness
07:50 - The Bitmap Format
11:47 - A Bitmap Encoder
19:34 - The Exercises