diff --git a/.github/pull_request_template.md b/.github/pull_request_template.md
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+# Pull Request
+
+## Goal
+Short summary of the goal of changes.
+
+## Changes
+Short summary of what was changed in code/documentation.
+
+## Type of change
+- [ ] Bug fix
+- [ ] New feature
+- [ ] Documentation update
+
+## Testing
+Explain how you tested your changes.
+
+## Checklist
+- [ ] Code follows project style
+- [ ] Code is fully tested
+- [ ] Documentation (inline and separate) updated if needed
+- [ ] No redundant files are committed
+- [ ] No secrets are committed
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diff --git a/.github/workflows/github-actions-demo.yml b/.github/workflows/github-actions-demo.yml
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+name: GitHub Actions Demo
+run-name: ${{ github.actor }} is testing out GitHub Actions 🚀
+on: 
+  push:
+  workflow_dispatch:
+jobs:
+  Explore-GitHub-Actions:
+    runs-on: ubuntu-latest
+    steps:
+      - run: echo "🎉 The job was automatically triggered by a ${{ github.event_name }} event."
+      - run: echo "🐧 This job is now running on a ${{ runner.os }} server hosted by GitHub!"
+      - run: echo "🔎 The name of your branch is ${{ github.ref }} and your repository is ${{ github.repository }}."
+      - name: Check out repository code
+        uses: actions/checkout@v5
+      - run: echo "💡 The ${{ github.repository }} repository has been cloned to the runner."
+      - run: echo "🖥️ The workflow is now ready to test your code on the runner."
+      - name: List files in the repository
+        run: |
+          ls ${{ github.workspace }}
+      - run: echo "🍏 This job's status is ${{ job.status }}."
+
+  System-Information:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Display System Information
+        run: |
+          echo "=== Operating System Information ==="
+          uname -a
+          cat /etc/os-release
+          echo ""
+          echo "=== CPU Information ==="
+          lscpu
+          echo ""
+          echo "=== Memory Information ==="
+          free -h
+          echo ""
+          echo "=== Disk Space ==="
+          df -h
+          echo ""
+          echo "=== Environment Variables ==="
+          echo "Runner OS: ${{ runner.os }}"
+          echo "Runner Architecture: ${{ runner.arch }}"
+          echo "Runner Name: ${{ runner.name }}"
+          echo "Runner Tool Cache: ${{ runner.tool_cache }}"
+          echo ""
+          echo "=== Installed Software ==="
+          echo "Python version:"
+          python3 --version
+          echo "Node.js version:"
+          node --version
+          echo "Docker version:"
+          docker --version
+          echo "Git version:"
+          git --version
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diff --git a/labs/submission5.md b/labs/submission5.md
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+# Lab 5 Submission
+
+## Task 1 — VirtualBox Installation 
+
+Host operating system: macOS Sonoma 14.4
+VirtualBox version: Version 7.2.6 r172322
+
+Below you could see image that proves that VirtualBox with specified version is installed:
+![VirtualBox Installation](img/vm_box.png)
+
+No issues were encountered during installation.
+
+## Task 2 — Ubuntu VM and System Analysis
+
+### 2.0 VM Configuration 
+
+VM configuration:
+- RAM: 4GB
+- Storage: 25GB
+- CPU: 2 cores
+- OS Version: Ubuntu 25.10 (ARM 64-bit)
+
+### 2.1 CPU details
+Command used: `lscpu`  
+Why: Displays CPU architecture, CPU count, vendor, core/thread topology, and low-level processor details in one command.  
+Result:  
+- Architecture: `aarch64` (64-bit)  
+- CPU(s): `2`  
+- Vendor ID: `Apple`  
+- Threads per core: `1`, cores per cluster: `2`  
+- Confirms ARM-based virtual machine CPU characteristics.  
+![CPU Details](img/cpu.png)
+
+### 2.2 Memory information
+Command used: `free -h`  
+Why: Shows total, used, free, and available RAM in human-readable units.  
+Result:  
+- Total RAM: `3.8Gi`  
+- Used RAM: `2.1Gi`  
+- Free RAM: `81Mi`  
+- Available RAM: `1.7Gi`  
+- Swap: `0B`  
+![Memory Information](img/ram.png)
+
+### 2.3 Network configuration
+Commands used: `ip a`, `ip route`  
+Why:  
+- `ip a` lists interfaces and assigned IP addresses.  
+- `ip route` shows routing table and default gateway.  
+Result:  
+- Active interface: `enp0s8`  
+- IPv4 address: `10.0.2.15/24`  
+- Loopback interface `lo` is present  
+- Default gateway: `10.0.2.2` via `enp0s8`  
+![Network Interfaces](img/network.png)
+![Routing Table](img/route.png)
+
+### 2.4 Storage information
+Command used: `df -hT`  
+Why: Reports mounted filesystems, filesystem types, size, used/free space, and mount points.  
+Result:  
+- Main root filesystem: `/dev/sda2` (`ext4`)  
+- Root size: `24G`, used: `6.2G`, available: `17G` (`28%` used)  
+- EFI partition: `/dev/sda1` (`vfat`) mounted on `/boot/efi`  
+![Storage Information](img/disk.png)
+
+### 2.5 Operating system
+Commands used: `cat /etc/os-release`, `uname -r`, `uname -a`  
+Why:  
+- `/etc/os-release` provides distribution/version identity.  
+- `uname -r` shows kernel release.  
+- `uname -a` shows full kernel/system/architecture string.  
+Result:  
+- Distribution: `Ubuntu 25.10 (Questing Quokka)`  
+- Kernel version: `6.17.0-14-generic`  
+- Architecture in kernel output: `aarch64` / `arm64`  
+![OS Release](img/os.png)
+![Kernel Information](img/kernel.png)
+
+### 2.6 Virtualization detection
+Commands used: `systemd-detect-virt`, `hostnamectl`, `dmesg | grep -i virtual`
+Why:  
+- `systemd-detect-virt` attempts to detect known virtualization providers.  
+- `hostnamectl` can show virtualization information on many setups.  
+- `dmesg | grep -i virtual` searches kernel boot/runtime logs for virtualization-related drivers and device names.
+Result:  
+- `systemd-detect-virt` returned `none`.  
+- `hostnamectl` showed OS/kernel/architecture, but no explicit virtualization field in this output.  
+- `dmesg | grep -i virtual` returned multiple entries containing `VirtualBox` (USB keyboard, USB tablet, mouse integration), which confirms VirtualBox virtual hardware is present.
+
+![Virtualization Detection](img/virtualization.png)
+![Virtualization Device Evidence](img/virtualization_device.png)
+
+Why we got such results:  
+1. ARM64 vs x86_64 discovery path  
+   Traditional VM detection tools often depend on DMI/SMBIOS metadata commonly available on x86_64 platforms. On ARM64 systems (like Apple Silicon), hardware discovery is often exposed differently, so those legacy identifiers may be absent.  
+2. VirtualBox behavior on Apple Silicon  
+   On M1/M2 Macs, VirtualBox integrates with Apple’s hypervisor stack and may not expose the same classic VirtualBox signatures (for example, `VBOX` DMI strings) that Linux detection tools commonly match.
+3. Why `dmesg` was successful  
+   `dmesg` reads kernel messages directly, including driver and device initialization logs. Even when high-level virtualization metadata is missing, kernel logs still recorded attached virtual devices labeled as `VirtualBox`, which provided direct practical evidence of virtualization.
+
+### 2.7 Reflection
+The most useful tools in this lab were:
+
+- `lscpu` — best single command for CPU analysis because it summarizes architecture, core count, and processor topology clearly.
+- `free -h` — fastest way to understand memory state in human-readable units without extra parsing.
+- `ip a` + `ip route` — most practical networking pair: first shows interface/IP assignment, second confirms gateway and actual routing behavior.
+- `df -hT` — very useful for storage checks because it combines capacity, usage, filesystem type, and mount point in one output.
+- `/etc/os-release` + `uname` — reliable combination to separate distribution-level information from kernel-level details.
+
+For virtualization detection in this specific ARM VirtualBox-on-macOS setup, the most useful final proof was `dmesg | grep -i virtual`, because kernel logs exposed `VirtualBox` device strings even when high-level detection commands returned no explicit virtualization status.
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