In the Decodable Reader Tool, you make groups of letters, sight words and other matching words.
We call each of these groups a stage. You can introduce words and letters and words in a sequence, one stage at a time.
Stages are numbered.
Stages are cumulative. All the letters and words from stages with lower numbers are included in stages with higher numbers.
https://vimeo.com/channels/bloomlibrary/121689458 is a video that can help you learn about stages.