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Customer service — from Zero to Expert

Customer Relations & Customer Service

Customer communication, handling requests, complaints & difficult customers, satisfaction (NPS) and loyalty.

7progressive levels
35detailed sections
100%free resources
ENinterface in English

🇫🇷 Version française 🇪🇸 Versión española 🌐 العربية

Updated September 26, 2026

How to follow this guide?

Guide resources

0

Level 0 — Customer relations fundamentals

Understand the stakes and what a customer really expects.

  1. Why customer relations matter
  2. Satisfaction, loyalty & customer experience
  3. Understanding customer expectations
  4. Customer relations channels
Start level 0 →
1

Level 1 — Beginner: communicating with customers

The basics of a successful customer interaction, whatever the channel.

  1. Welcome & first impressions
  2. Active listening & empathy
  3. Adapt your speech & vocabulary
  4. Customer relations by phone
  5. Customer relations by email & chat
Start level 1 →
4

Level 4 — Expert: measuring & improving satisfaction

Steer service quality through data and continuous improvement.

  1. Satisfaction metrics (NPS, CSAT, CES)
  2. Satisfaction surveys & feedback
  3. Analyze pain points & the customer journey
  4. Continuous service improvement
  5. Customer service dashboards
Start level 4 →
6

Level 6 — In practice

Case studies, error playbook, toolkit and field feedback.

  1. Case studies
  2. Recurring issues (playbook)
  3. Best practices & pitfalls
  4. Toolkit
  5. Field feedback
  6. Going further
Start level 6 →