HTTPS and TLS Certificates Explained

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About Course

What does the padlock in your browser actually mean? This course explains how HTTPS uses TLS to protect data in transit, what digital certificates and certificate authorities do, which TLS versions the NCSC recommends, and how HSTS, redirects and certificate renewal keep a website secure.

Tutwoo is an independent learning provider. This course is general training based on NCSC guidance and MDN documentation. It is not produced or endorsed by those organisations and is not an accredited qualification.

© 2026 Tutwoo UK Limited. This course was created in-house by Tutwoo and is our original work. It is for your own learning only: please do not copy, share, record or resell it.

What Will You Learn?

  • Explain what TLS protects – and what it does not
  • Describe how certificates and certificate authorities establish trust
  • Apply NCSC recommendations on TLS versions and HTTPS-only configuration
  • Avoid common mistakes such as expired certificates and mixed content

Course Content

Course Lessons

  • What HTTPS and TLS do
  • Certificates and certificate authorities
  • Configuring HTTPS well: NCSC recommendations

Sources & Further Reading
The official guidance this course is based on.

Final Assessment

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