Write description for cherry-pick command

src/day_3/notes.md

@@ -50,8 +50,38 @@ if you want to stage all changes.
 
 ## git revert
 
+
 ## git cherry-pick
 
+### Description
+
+The `git cherry-pick` command applies a specific commit from one branch to another. This can be useful for undoing changes, applying bug fixes to a different branch, or picking out specific changes from a merge commit.
+
+### Usage
+
+The basic syntax for the `git cherry-pick` command is:
+
+```bash
+git cherry-pick <commit-hash>
+```
+where `<commit-hash>` is the SHA-1 hash of the commit you want to cherry-pick. You can also use the `-n` option to preview the changes without actually applying them.
+
+For example, to cherry-pick the commit with the SHA-1 hash `1234567890abcdef`, you would run the following command:
+
+```bash
+git cherry-pick 1234567890abcdef
+```
+
+### Options
+
+The `git cherry-pick` command has a few options that you can use to customize its behavior:
+
+* `-n`: Preview the changes without actually applying them.
+* `-e`: Edit the commit message before applying it.
+* `-s`: Sign the commit with your GPG key.
+* `-S[<keyid>]`: Sign the commit with the specified GPG key.
+
+
 ## git remote
 
 ## git blame