Merge pull request 'added git checkout' (#17) from Steven/dev-tools-course:git_checkout into main

Reviewed-on: https://codeberg.org/mo8it/dev-tools/pulls/17

src/day_3/notes.md

@@ -58,6 +58,22 @@ git commit -m "Your commit message here"
 
 ## git checkout
 
+This command enables you to switch to another branch or to another commit.
+
+Examples are:
+
+```bash
+git checkout "branchname"
+```
+
+or
+
+```bash
+git checkout -b "branchname"
+```
+
+If you want to create a new branch and switch to it.
+
 ## git push
 
 ## git pull
@@ -66,12 +82,77 @@ git commit -m "Your commit message here"
 
 ## git merge
 
+This command is used to combine two branches together. Use git checkout to visit the branch you want to merge to.
+
+```bash
+$ git checkout main
+$ git merge branch2
+```
+
+This will merge the branch "branch2" into the branch, where this command was executed in.(Here: "main")
+
 ## git reset
 
 ## 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
+```
+
+Example with visualization of the git log graph:
+
+- Let's assume the current branch state:
+```bash
+    a - b - c - d   Main
+         \
+           e - f - g Feature
+```
+
+- Ensure that we'are working in the `main` branch:
+```bash
+git checkout main
+```
+
+- Then let's execute the following `cherry-pick` command:
+```bash
+git cherry-pick f
+```
+
+- Once executed, branch state will change to:
+```bash
+    a - b - c - d - f   Main
+         \
+           e - f - g Feature
+```
+
+### 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