How to compare 2 commits in git 

To compare two commits in Git, you use the git diff command followed by the commit identifiers. 

Compare via Command Line

• Detailed code changes: Run git diff <commit1> <commit2> to see line-by-line differences between two commits.
• High-level summary: Run git diff --stat <commit1> <commit2> to view a list of changed files and line counts.
• Single file comparison: Run git diff <commit1> <commit2> -- <path/to/file> to restrict the comparison to one specific file. 

Note: You can use full commit hashes, short 7-character hashes, or reference pointers like HEAD and HEAD~1.

Understanding Comparison Types

Notation Syntax	Comparison Logic	Best Used For
git diff commit1 commit2	Compares the exact states of the two snapshots directly.	Comparing arbitrary points in history.
git diff commit1..commit2	Identical to using a space; compares the tips of both commits directly.	Standard branch-to-branch or commit comparisons.
git diff commit1...commit2	Compares the common ancestor of both commits with commit2.	Seeing only changes introduced by a feature branch, ignoring target updates.