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.
+Learn Linux with this comprehensive learning path designed for beginners. These practical Linux courses provide a clear roadmap for mastering Linux administration, from the command-line interface to system administration and shell scripting. Gain real-world experience through hands-on, non-video exercises in an interactive shell playground, focusing on 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 | [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)            |
+|       2 | [Become a Junior System Administrator](https://labex.io/courses/become-a-junior-system-administrator)   | Beginner     | [🔗 Repo](https://github.com/labex-labs/become-a-junior-system-administrator) | [🚀 Start Lab](https://labex.io/courses/become-a-junior-system-administrator) |
+|       3 | [Linux for Noobs](https://labex.io/courses/linux-for-noobs)                                             | Beginner     | [🔗 Repo](https://github.com/labex-labs/linux-for-noobs)                      | [🚀 Start Lab](https://labex.io/courses/linux-for-noobs)                      |
+|       4 | [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) |
+|       5 | [Shell for Beginners](https://labex.io/courses/shell-for-beginners)                                     | Beginner     | [🔗 Repo](https://github.com/labex-labs/shell-for-beginners)                  | [🚀 Start Lab](https://labex.io/courses/shell-for-beginners)                  |
+|       6 | [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)     |
+|       7 | [CTF for Beginners](https://labex.io/courses/ctf-for-beginners)                                         | Beginner     | [🔗 Repo](https://github.com/labex-labs/ctf-for-beginners)                    | [🚀 Start Lab](https://labex.io/courses/ctf-for-beginners)                    |
+|       8 | [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