Merge branch 'collaboration/03-git-pull'

Author: Amin Jafari

git-pull.md

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+# Git Pull
+
+The `git pull` command downloads and merges changes from a remote repository.
+
+## Usage
+```bash
+git pull <remote> <branch>
+```
+
+## Explanation
+- Combines `git fetch` and `git merge` in one command.
+
+- Updates your local branch with changes from the remote.
+
+## Example
+```bash
+git pull origin main
+```