Change chapter 6

contents/06- Deploy, configure, and maintain systems/01- Schedule tasks using at and cron.md

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+## 01- Schedule tasks using at and cron:
+
 The RHCSA exam topic **"Schedule tasks using `at` and `cron`"** focuses on automating task execution at specific times or intervals. **`at`** and **`cron`** are essential tools in Linux for task scheduling:
 
 - **`at`**: Schedules a one-time task at a specific time.

contents/06- Deploy, configure, and maintain systems/02- Start and stop services and configure services to start automatically at boot.md

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+## 02- Start and stop services and configure services to start automatically at boot:
+
 The RHCSA exam topic **"Start and stop services and configure services to start automatically at boot"** focuses on managing system services using **`systemctl`**, the command used to control the **systemd** service manager. You’ll need to understand how to start, stop, restart, and enable/disable services, and ensure that service configurations are persistent across reboots.
 
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contents/06- Deploy, configure, and maintain systems/03- Configure systems to boot into a specific target automatically.md

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+## 03- Configure systems to boot into a specific target automatically:
+
 The RHCSA exam topic **"Configure systems to boot into a specific target automatically"** focuses on understanding **systemd targets** and how to configure a system to boot into a specific target (e.g., graphical mode, multi-user mode, etc.). Systemd targets are used to define the state the system should be in after boot, such as **graphical** mode (with a graphical user interface) or **multi-user** mode (without a graphical interface).
 
 

contents/06- Deploy, configure, and maintain systems/04- Configure time service clients.md

@@ -1,3 +1,5 @@
+## 04- Configure time service clients:
+
 The RHCSA exam topic **"Configure time service clients"** focuses on setting up time synchronization on a system. Correct time configuration is critical in Linux environments, as it ensures consistency across servers, logs, scheduled jobs, and security protocols. On RHEL 8, time services are managed using **`chronyd`**, which is the default daemon for time synchronization (replacing the older **`ntpd`** service).
 
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contents/06- Deploy, configure, and maintain systems/05- Install and update software packages from Red Hat Network, a remote repository, or from the local file system.md

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+## 05- Install and update software packages from Red Hat Network, a remote repository, or from the local file system:
+
 The RHCSA exam topic **"Install and update software packages from Red Hat Network, a remote repository, or from the local file system"** involves managing software on a RHEL system using the **`yum`** or **`dnf`** package manager. You need to know how to install, update, and manage software packages from different sources like the Red Hat repositories, third-party repositories, or local package files.
 
 ---

contents/06- Deploy, configure, and maintain systems/06- Modify the system bootloader.md

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+## 06- Modify the system bootloader:
+
 The RHCSA exam topic **"Modify the system bootloader"** refers to tasks related to managing the **GRUB2** bootloader, which is the default bootloader used in RHEL-based systems. GRUB2 (GRand Unified Bootloader version 2) is responsible for loading the operating system kernel and initializing the boot process.
 
 In the RHCSA exam, you may be asked to perform tasks such as changing the default kernel, modifying boot parameters, or recovering access to a system by modifying GRUB2 at boot time.

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