Adding exercises

cpp-exercise.md

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+# C++ Exercise — "Hello, You!"
+
+**Goal:** Write, compile, and run a C++ program that asks for your name. Then automate the build with a Makefile.
+
+**Time:** ~10–15 minutes
+
+---
+
+### Step 1 — Write the program
+
+```bash
+cd ~/my-project
+nano greet.cpp
+```
+
+Type this in:
+
+```cpp
+#include <iostream>
+#include <string>
+
+int main() {
+    std::string name;
+    std::cout << "What is your name? ";
+    std::getline(std::cin, name);
+    std::cout << "Hello, " << name << "!" << std::endl;
+    return 0;
+}
+```
+
+Save: **Ctrl + O**, then **Enter**  
+Exit: **Ctrl + X**
+
+### Step 2 — Compile it
+
+```bash
+clang++ -Wall greet.cpp -o greet
+```
+
+- `-Wall` turns on warnings (catches mistakes)
+- `-o greet` names the output file `greet`
+
+If there are no errors, no message is printed — that's good!
+
+### Step 3 — Run it
+
+```bash
+./greet
+```
+
+Type your name and press **Enter**. It should say hello back.
+
+### Step 4 — Create a Makefile
+
+```bash
+nano Makefile
+```
+
+Type this:
+
+```make
+CXX      = clang++
+CXXFLAGS = -Wall -std=c++20
+TARGET   = greet
+
+$(TARGET): greet.cpp
+	$(CXX) $(CXXFLAGS) greet.cpp -o $(TARGET)
+
+clean:
+	rm -f $(TARGET)
+
+.PHONY: clean
+```
+
+**Important:** The indented lines must use a **Tab** character, not spaces.
+
+Save and exit (**Ctrl + O**, **Enter**, **Ctrl + X**).
+
+### Step 5 — Build with make
+
+```bash
+make clean
+make
+```
+
+`make clean` deletes the old `greet` binary. `make` rebuilds it.
+
+### Step 6 — Run again (via make build)
+
+```bash
+./greet
+```
+
+---
+
+**Commands you used:** `nano`, `clang++`, `./` (run), `make`, `make clean`
+
+**What you learned:**
+- Writing a basic C++ program with input and output
+- Compiling with `clang++` and useful flags
+- Creating a `Makefile` to automate the build
+- Using `make` and `make clean`

git-exercise.md

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+# Git Exercise — "Track a Poem"
+
+**Goal:** Turn a folder into a Git repo, make commits, experiment with branches, and merge.
+
+**Time:** ~10–15 minutes
+
+---
+
+### Step 1 — Set up (do once on your machine)
+
+```bash
+git config --global user.name "Your Name"
+git config --global user.email "you@example.com"
+```
+
+### Step 2 — Create a project and turn it into a Git repo
+
+```bash
+cd ~/my-project
+git init
+```
+
+You should see: `Initialized empty Git repository...`
+
+### Step 3 — Create your first file and commit it
+
+```bash
+echo "Roses are red" > poem.txt
+git add poem.txt
+git commit -m "Add first line of poem"
+```
+
+### Step 4 — Add a second line
+
+```bash
+echo "Violets are blue" >> poem.txt
+```
+
+### Step 5 — See what changed
+
+```bash
+git status
+git diff
+```
+
+`git status` shows the file is modified. `git diff` shows exactly what lines changed.
+
+### Step 6 — Commit the change
+
+```bash
+git add .
+git commit -m "Add second line"
+```
+
+### Step 7 — View the history
+
+```bash
+git log --oneline
+```
+
+You should see two commits.
+
+### Step 8 — Create a branch and switch to it
+
+```bash
+git checkout -b spanish
+```
+
+This creates a branch named `spanish` and switches to it.
+
+### Step 9 — Add a Spanish version on this branch
+
+```bash
+echo "Las rosas son rojas" > poem_es.txt
+git add .
+git commit -m "Add Spanish version"
+```
+
+### Step 10 — Switch back to main
+
+```bash
+git checkout main
+```
+
+List the files — notice `poem_es.txt` is gone. It only exists on the `spanish` branch.
+
+```bash
+ls
+```
+
+### Step 11 — Merge the branch
+
+```bash
+git merge spanish
+```
+
+Now `poem_es.txt` is back on `main`.
+
+```bash
+ls
+git log --oneline
+```
+
+### Step 12 — Clean up the branch (optional)
+
+```bash
+git branch -d spanish
+```
+
+---
+
+**Commands you used:** `git config`, `git init`, `git add`, `git commit`, `git status`, `git diff`, `git log`, `git checkout`, `git merge`, `git branch`
+
+**What you learned:**
+- Starting a Git repo
+- Staging and committing changes
+- Viewing history and differences
+- Creating and switching branches
+- Merging branches together

wsl-ubuntu-exercise.md

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+# WSL / Ubuntu Exercise — "My First Project"
+
+**Goal:** Create a project folder, add files, edit them, and explore.
+
+**Time:** ~10 minutes
+
+---
+
+### Step 1 — Create a folder and go inside
+
+```bash
+mkdir my-project
+cd my-project
+```
+
+### Step 2 — Create a file with some text
+
+```bash
+echo "Hello from WSL!" > hello.txt
+```
+
+Now look at what's in the folder:
+
+```bash
+ls
+```
+
+### Step 3 — View the file
+
+```bash
+cat hello.txt
+```
+
+### Step 4 — Edit the file
+
+```bash
+nano hello.txt
+```
+
+Inside nano:
+- Add a new line (e.g. `Today I am learning Linux commands.`)
+- Save: **Ctrl + O**, then **Enter**
+- Exit: **Ctrl + X**
+
+### Step 5 — See your changes
+
+```bash
+cat hello.txt
+```
+
+### Step 6 — Create a backup folder and copy the file
+
+```bash
+mkdir backup
+cp hello.txt backup/
+ls backup/
+```
+
+### Step 7 — List everything in detail
+
+```bash
+ls -la
+```
+
+Notice the file sizes, dates, and permissions.
+
+### Step 8 — Clean up (go back home)
+
+```bash
+cd ~
+```
+
+---
+
+**Commands you used:** `mkdir`, `cd`, `echo`, `ls`, `cat`, `nano`, `cp`, `ls -la`
+
+**What you learned:**
+- Creating and navigating folders
+- Creating, viewing, and editing files
+- Copying files and listing details