Tech | Hows

### Step 3.2: Install the database
Goal: Have PostgreSQL accepting local connections.
Commands:
sudo apt update
sudo apt install postgresql -y
sudo systemctl status postgresql
</code></pre>
<p><strong>Verification:</strong> The output should show <code>active (running)</code>.</p>
<p><strong>If stuck:</strong> Run <code>sudo journalctl -u postgresql -n 20</code> and look for "port 5432 already in use".</p>
<pre><code>
### Parts List Table
| Qty | Part | Model | Approx Cost |
|-----|------|-------|--------------|
| 1 | SBC | Raspberry Pi 5 8GB | $80 |
| 1 | Power supply | Official 27W USB-C | $15 |
---
## Final Checklist Before Publishing
- [ ] Did you define the reader's starting skill level?
- [ ] Is there a verification step after every 3–5 actions?
- [ ] Are all code blocks tested on a clean system?
- [ ] Are screenshots readable at 100% zoom?
- [ ] Did you include a troubleshooting section?
- [ ] Is there a date and a "tested on" line?
- [ ] Can a reader skip to any section and still follow?
---
**The golden rule of long technical guides:**  
*Every minute you spend making a step foolproof saves 1000 readers one minute each.*
</code></pre>


| Item | Specification | Example |
|------|--------------|---------|
| SBC | 4GB RAM min | Raspberry Pi 5 |
| Power | 5V/5A USB-C | Official Pi PSU |
| Storage | 32GB microSD | Sandisk Extreme | hows tech
| Symptom | Likely Cause | Fix |
|---------|--------------|-----|
| command not found | Missing package | apt install <pkg> |
| USB drive not detected | Wrong port | Use USB 3.0 port #2 | ### Step 3

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