Git Version Comparison: How to View Code Differences Between Different Versions

Git version comparison is a fundamental and commonly used operation, tracking code changes through diff tools to facilitate collaboration and management. Scenarios requiring version comparison include: locating development errors, checking the staging area before commits, understanding differences before merging branches, and confirming content before rolling back. Common commands and scenarios: 1. Differences between the working directory and the staging area: `git diff`; 2. Differences between the staging area and the most recent commit: `git diff --staged`; 3. Differences between two historical commits: `git diff <commit1> <commit2>` (supports relative commit names like `HEAD~n`); 4. Differences between two branches: `git diff branch1 branch2`; 5. Viewing the content of a single commit: `git show <commit-id>`. Graphical tools (such as VS Code, GitKraken) are suitable for beginners. Mastering commands for different scenarios enables efficient code version management.