Docker or Postman First: What Beginners Should Pick

# Docker basics

# Build an image
docker build -t myapp:1.0 .

# Run a container
docker run -d -p 8000:8000 myapp:1.0

# List running containers
docker ps

# Stop a container
docker stop <container-id>

# Use Docker Compose
docker compose up -d

Week 1 Review:
□ Do I understand images vs containers?
□ Can I write a simple Dockerfile?
□ Have I built and run an image?

Week 2 Review:
□ Do I understand ports and volumes?
□ Can I use docker ps and docker logs?
□ Have I debugged a container?

Week 3 Review:
□ Do I understand Docker Compose?
□ Can I run multi-container apps?
□ Have I pushed to Docker Hub?

Week 4 Review:
□ Have I containerized a small project?
□ Is it on GitHub?
□ Do I feel ready to deploy?

Postman basics — what you actually do:

1. Create a request
   - Method: GET / POST / PUT / DELETE
   - URL: https://api.example.com/users

2. Send it
   - Add headers, body, auth

3. Inspect the response
   - Status code, JSON body, headers

4. Save as a collection
   - Reuse across the team

5. Write tests
   - "status is 200"
   - "body has email field"

Week 1 Review:
□ Do I understand HTTP methods?
□ Can I send a request and view the response?
□ Do I know what status codes mean?

Week 2 Review:
□ Can I add headers and JSON bodies?
□ Do I understand authentication basics?
□ Have I saved a request as a collection?

Week 3 Review:
□ Can I write a basic test script?
□ Do I understand environments and variables?
□ Have I chained requests?

Week 4 Review:
□ Have I tested a real API end-to-end?
□ Is my collection documented?
□ Do I feel ready for backend work?

Recommended order for beginners:

Week 1-2 — Postman basics
  - HTTP methods, headers, JSON
  - Send requests to a public API
  - Save collections

Week 3-4 — Docker basics
  - Install Docker
  - Write a Dockerfile
  - Run and stop containers

Week 5+ — Combine both
  - Test your API in Postman
  - Containerize your API with Docker
  - Ship the whole thing

Snapshot:

Point        Docker                Postman
Type         Container platform    API testing tool
Start        Setup required        Instant
Jobs         DevOps, deployment    Backend, QA, APIs
Best for     Packaging, shipping   Testing, exploring

Postman — 90-Day Roadmap:
Month 1 — Basics
  Week 1: HTTP, methods, status codes
  Week 2: Send requests & read responses
  Week 3: Headers, body, auth
  Week 4: Collections and variables

Month 2 — Intermediate
  Week 5: Pre-request scripts
  Week 6: Test scripts
  Week 7: Chaining requests
  Week 8: Mock servers

Month 3 — Projects
  Week 9:  Full API test suite
  Week 10: Newman + CI
  Week 11: Documentation
  Week 12: Apply to backend/QA roles

Milestones:
□ Comfortable with all HTTP methods
□ 2-3 tested APIs on GitHub
□ Tests in a CI pipeline

Docker — 90-Day Roadmap:
Month 1 — Basics
  Week 1: Images, containers, Dockerfile
  Week 2: Build, run, inspect
  Week 3: Volumes and networking
  Week 4: docker-compose

Month 2 — Real Apps
  Week 5: Containerize a web app
  Week 6: Multi-service compose
  Week 7: Volumes & environment variables
  Week 8: Publish to Docker Hub

Month 3 — Deploy
  Week 9:  Containerize a full app
  Week 10: Deploy to cloud
  Week 11: Clean up images
  Week 12: Apply to DevOps roles

Milestones:
□ 2-3 Dockerized apps on GitHub
□ Compose stack working
□ One app deployed publicly

Daily Tracker:
Date: _________
☐ Morning routine completed
☐ Learning (1 hour)
☐ Hands-on practice (2 hours)
☐ Read docs (30 min)
☐ Notes + reflection
☐ Exercise completed
☐ Reviewed progress
☐ Planned tomorrow

Today's Accomplishments:
1. 
2. 
3. 

Tomorrow's Priorities:
1. 
2. 
3. 

Weekly Tracker:
Week: _____

Goals for this week:
1. 
2. 
3. 

Daily Progress:
Mon: ☐☐☐
Tue: ☐☐☐
Wed: ☐☐☐
Thu: ☐☐☐
Fri: ☐☐☐
Sat: ☐☐☐
Sun: ☐☐☐

Weekly Wins:
1. 
2. 
3. 

Challenges & Solutions:
1. 
2. 

Next Week's Goals:
1. 
2. 
3. 

Monthly Tracker:
Month: _____

Monthly Goal:
_______________________________________________

Week 1 Progress: ☐☐☐
Week 2 Progress: ☐☐☐
Week 3 Progress: ☐☐☐
Week 4 Progress: ☐☐☐

Monthly Wins:
1. 
2. 
3. 

Skills Gained:
1. 
2. 
3. 

Projects Completed:
1. 
2. 
3. 

Applications Sent: _____
Interviews: _____
Offers: _____

Next Month's Goal:
_______________________________________________