Update README.md

Author: huhuhang

README.md

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 Linux is a powerful, open - source operating system. This Skill Tree provides a comprehensive learning path for mastering Linux administration. Ideal for IT beginners, it offers a clear roadmap to understand command - line interfaces, system administration, and shell scripting. Through hands - on, non - video courses and practical exercises in an interactive shell playground, you'll gain real - world experience in managing Linux systems and automating tasks.
 
-|   Index | Name                                                                                     | Difficulty   | Repo                                                                          | Practice                                                                      |
-|---------|------------------------------------------------------------------------------------------|--------------|-------------------------------------------------------------------------------|-------------------------------------------------------------------------------|
-|       1 | [Quick Start with Linux](https://labex.io/courses/quick-start-with-linux)                | Beginner     | [🔗 Repo](https://github.com/labex-labs/quick-start-with-linux)               | [🚀 Start Lab](https://labex.io/courses/quick-start-with-linux)               |
-|       2 | [Linux for Noobs](https://labex.io/courses/linux-for-noobs)                              | Intermediate | [🔗 Repo](https://github.com/labex-labs/linux-for-noobs)                      | [🚀 Start Lab](https://labex.io/courses/linux-for-noobs)                      |
-|       3 | [Practice Linux Commands](https://labex.io/courses/linux-basic-commands-practice-online) | Beginner     | [🔗 Repo](https://github.com/labex-labs/linux-basic-commands-practice-online) | [🚀 Start Lab](https://labex.io/courses/linux-basic-commands-practice-online) |
-|       4 | [Quick Start with Shell](https://labex.io/courses/quick-start-with-shell)                | Beginner     | [🔗 Repo](https://github.com/labex-labs/quick-start-with-shell)               | [🚀 Start Lab](https://labex.io/courses/quick-start-with-shell)               |
-|       5 | [Linux Software Playgrounds](https://labex.io/courses/linux-software-playgrounds)        | Beginner     | [🔗 Repo](https://github.com/labex-labs/linux-software-playgrounds)           | [🚀 Start Lab](https://labex.io/courses/linux-software-playgrounds)           |
-|       6 | [Linux Practice Challenges](https://labex.io/courses/linux-practice-challenges)          | Beginner     | [🔗 Repo](https://github.com/labex-labs/linux-practice-challenges)            | [🚀 Start Lab](https://labex.io/courses/linux-practice-challenges)            |
+|   Index | Name                                                                                                    | Difficulty   | Repo                                                                          | Practice                                                                      |
+|---------|---------------------------------------------------------------------------------------------------------|--------------|-------------------------------------------------------------------------------|-------------------------------------------------------------------------------|
+|       1 | [Quick Start with Linux](https://labex.io/courses/quick-start-with-linux)                               | Beginner     | [🔗 Repo](https://github.com/labex-labs/quick-start-with-linux)               | [🚀 Start Lab](https://labex.io/courses/quick-start-with-linux)               |
+|       2 | [Linux for Noobs](https://labex.io/courses/linux-for-noobs)                                             | Intermediate | [🔗 Repo](https://github.com/labex-labs/linux-for-noobs)                      | [🚀 Start Lab](https://labex.io/courses/linux-for-noobs)                      |
+|       3 | [Practice Linux Commands](https://labex.io/courses/linux-basic-commands-practice-online)                | Beginner     | [🔗 Repo](https://github.com/labex-labs/linux-basic-commands-practice-online) | [🚀 Start Lab](https://labex.io/courses/linux-basic-commands-practice-online) |
+|       4 | [Quick Start with Shell](https://labex.io/courses/quick-start-with-shell)                               | Beginner     | [🔗 Repo](https://github.com/labex-labs/quick-start-with-shell)               | [🚀 Start Lab](https://labex.io/courses/quick-start-with-shell)               |
+|       5 | [CompTIA Linux+ Certification Training Labs](https://labex.io/courses/comptia-linux-plus-training-labs) | Beginner     | [🔗 Repo](https://github.com/labex-labs/comptia-linux-plus-training-labs)     | [🚀 Start Lab](https://labex.io/courses/comptia-linux-plus-training-labs)     |
+|       6 | [Linux Software Playgrounds](https://labex.io/courses/linux-software-playgrounds)                       | Beginner     | [🔗 Repo](https://github.com/labex-labs/linux-software-playgrounds)           | [🚀 Start Lab](https://labex.io/courses/linux-software-playgrounds)           |
+|       7 | [Linux Practice Challenges](https://labex.io/courses/linux-practice-challenges)                         | Beginner     | [🔗 Repo](https://github.com/labex-labs/linux-practice-challenges)            | [🚀 Start Lab](https://labex.io/courses/linux-practice-challenges)            |
 
 ## More