You can see the changes to the content of a repository by analyzing the repository's commits, commit frequency, and content additions and deletions.
You can see all commits made to a repository in the past year (excluding merge commits) in the Commit graph.
The Code frequency graph displays the content additions and deletions for each week in a repository's history.
The Punch card graph shows the frequency of updates to a repository based on the day of week and time of day. The size of the black circle indicates commit frequency. Merge commits aren't included in this graph.