Why This Matters

Mistakes compound — a beginner who internalizes these 15 patterns will skip months of trial-and-error. This lesson is the cheat sheet you wish you had on day one.

Concept Explained

15 mistakes grouped by category: prompting (5), workflow (4), safety (3), tooling (3). Each has a one-line fix.

How It Works

Read the 15 mistakes. For each, ask: 'have I done this?' If yes, apply the fix. Build a personal checklist of the ones you're prone to. Re-check monthly.

Step-by-Step Tutorial

1. Read the 15 mistakes

2. Self-check

3. Apply fixes

4. Build personal checklist

5. Re-check monthly

Real-World Example

A team printed the 15 mistakes as a one-pager and pinned it in their team room. Three months later, 'Copilot-induced bugs' dropped 70%. The team attributed most of the gain to mistake #2 (read before accepting) and #7 (never paste secrets).

Example Prompts / Commands / Code

PROMPTING MISTAKES:
1.  Vague prompts ('fix this')           → Specify types, constraints, examples.
2.  Not reading suggestions              → Read every suggestion aloud before Tab.
3.  No role for specialized tasks        → Add 'Act as a senior X engineer'.
4.  Wrong format for the task            → Match format to use (JSON for automation).
5.  Reusing threads across tasks         → One thread per task; start fresh.

WORKFLOW MISTAKES:
6.  Tab-Tab-Tab without verification     → Apply accept-reject-iterate loop.
7.  Pasting secrets into Chat            → Redact; use placeholders.
8.  Not running tests after accept       → Verify every acceptance.
9.  Using wrong surface for the task     → Match surface to scope (inline/chat/CLI).

SAFETY MISTAKES:
10. Trusting unfamiliar APIs             → Cross-check official docs.
11. Duplicate filter on 'Allow' for work → Set to 'Block'.
12. Personal Pro for work code           → Use Business seat; opt out of training.

TOOLING MISTAKES:
13. Never cycling alternatives           → Alt+[/] when first suggestion feels off.
14. Forgetting @terminal for debugging   → Use @terminal instead of pasting logs.
15. One model for everything              → Try different models; they differ.

Common Mistakes

• Reading the list without self-checking.
• Not building a personal checklist — generic advice doesn't stick.
• Forgetting to revisit monthly — habits drift.

Best Practices

• Self-check each mistake honestly.
• Apply fixes immediately for 'yes' answers.
• Build a personal top-5 checklist; pin it visible.
• Re-check monthly; habits drift.
• Share with teammates — team-wide adoption compounds.

Troubleshooting

Practical Exercise

Professional Challenge

Frequently Asked Questions

Further Reading

• Responsible use

Official References

• Responsible use

Related lessons: BE-13, BE-31, BE-32