Add motivation and first steps

lectures/git/slides.qmd

@@ -4,24 +4,60 @@ subtitle: "A Brief Introduction into Git"
 author: "Lukas Kluft and Georgiana Mania"
 ---
 
-## What is git?
 
-(2-3 slides - Lukas)
+## Version control systems
 
-* why is it useful?
-* main concepts: local vs remote repository, history, 
-* web interfaces : GitHub, GitLab, BitBucket
+There are many version control systems out there (e.g. Subversion, CVS, Mercurial). We will focus on [Git](http://git-scm.com) which is the **de facto standard**
 
-## Get Started 
+![](https://git-scm.com/images/logos/downloads/Git-Logo-2Color.svg "Git logo"){height=10%}
 
-(local repo only - 7-8 slide (commands & expl - Lukas)
+## Why version control?
 
-* setup configs (username, email)
-* create repository from local sources (git add, git commit, git push)
-* basic commands: git log, git diff, git status, check commit history
+::: {.incremental}
+* **Exchange** _I'll send you my script via mail._
+* **Collaboration** _Sample File (conflicted copy 2019-11-21)_
+* **Storing versions** (properly) _But it worked yesterday..._ 😭
+* **Tracking** _I did not change anything!!11!_ 🤬
+* **Backup** _I replaced the wrong my_file_2_final_final.py_ 😱
+:::
+
+## As easy as **1, 2, 3**
+```bash
+git init .  # Initialize a repository
+git add .  # Add the whole directory content
+git commit -m "Initial commit"  # Commit your changes
+```
+
+## The basic workflow
+
+* Git offers plenty of functionality that is extensively documented
+
+* You will only need a **handful of commands** in your day to day work:
+
+  ```bash
+  git status  # show which files have changed
+  git diff my_file  # show what has changed
+  git add my_file  # stage changes
+  git commit  # commit your changes
+  ```
+
+## Configuration
+
+* Each commit is attributed to an author
+
+* The concept or authorship is heaviy used on other platforms (e.g. GitLab)
+
+```bash
+git config --global user.name "Your Name"
+git config --global user.email "youremail@yourdomain.com"
+```
 
 # Hands-on Session! {background-color=var(--dark-bg-color)}
 
+1. Configure the username and email adress in your local git client
+2. Initializse an empty Git repository
+3. Create a file and add it to the repo
+3. Change the file, inspect the differences, and commit the changes
 
 ## Branches