Enhance documentation for Tinkerblox UltraEdge: update descriptions and improve image alt texts for clarity

Author: madeline-underwood

content/learning-paths/cross-platform/tinkerblox_ultraedge/_index.md

@@ -2,6 +2,8 @@
 title: Deploy Tinkerblox UltraEdge HPC-I for AI and mixed workloads on Arm
 minutes_to_complete: 60 
 
+description: Learn how to deploy Tinkerblox UltraEdge HPC-I for edge AI and mixed workloads on Arm platforms, including installation and configuration on Debian, Ubuntu, and Yocto systems.
+
 who_is_this_for: This is an advanced topic for business, R&D, and engineering teams seeking to optimize CPU and GPU infrastructure utilization while reducing total cost of ownership on edge and constrained environments. It's ideal for innovation and development teams building next-generation AI workloads using alternative runtime environments and packaging technologies.
 
 learning_objectives:

content/learning-paths/cross-platform/tinkerblox_ultraedge/background.md

@@ -71,7 +71,7 @@ UltraEdge orchestrates edge-native execution for high-performance compute infras
 
 UltraEdge is composed of layered systems, each responsible for a distinct aspect of execution and orchestration:
 
-![UltraEdge high-level architecture diagram showing layered execution systems for edge AI and mixed workloads alt-txt#center](https://raw.githubusercontent.com/Tinkerbloxsupport/arm-learning-path-support/main/static/images/High-level%20architecture%20diagram.png "UltraEdge high-level architecture")
+![UltraEdge high-level architecture diagram showing layered execution systems for edge AI and mixed workloads#center](https://raw.githubusercontent.com/Tinkerbloxsupport/arm-learning-path-support/main/static/images/High-level%20architecture%20diagram.png "UltraEdge high-level architecture")
 
 UltraEdge organizes functionality into five specialized layers. Each layer is responsible for a specific aspect of workload execution and orchestration:
 

content/learning-paths/cross-platform/tinkerblox_ultraedge/debian_installation.md

@@ -17,13 +17,13 @@ Follow these steps to initialize and register your device within the **Uncloud**
 * **Provision a New Device:**
     * Go to **Device Management** > **New Device**.
 
-![Device Management](https://raw.githubusercontent.com/Tinkerbloxsupport/arm-learning-path-support/main/static/images/Device_managment.png)
+![Screenshot of the Uncloud Dashboard showing the Device Management section with the navigation menu highlighting the option to create a new device#center](https://raw.githubusercontent.com/Tinkerbloxsupport/arm-learning-path-support/main/static/images/Device_managment.png "Device Management interface")
 
-![Creating New Device](https://raw.githubusercontent.com/Tinkerbloxsupport/arm-learning-path-support/main/static/images/creating_new_device.png)
+![Screenshot of the Uncloud interface showing the New Device creation form where you can configure device settings and register a new edge device#center](https://raw.githubusercontent.com/Tinkerbloxsupport/arm-learning-path-support/main/static/images/creating_new_device.png "Creating a new device")
 
 * Click the **three dots (options menu)** next to your device entry and select **Initialize**.
 
-![Initialize Device](https://raw.githubusercontent.com/Tinkerbloxsupport/arm-learning-path-support/main/static/images/Initialize%20.png)
+![Screenshot of the Uncloud Dashboard showing the device options menu with the Initialize option highlighted to begin the device setup process#center](https://raw.githubusercontent.com/Tinkerbloxsupport/arm-learning-path-support/main/static/images/Initialize%20.png "Initialize device option")
 
 * **Install prerequisites:**
 
@@ -39,7 +39,7 @@ sudo apt install -y curl jq
 
     Copy the generated device installation command or details from the **Uncloud** portal to your clipboard.
 
-![Installation Command](https://raw.githubusercontent.com/Tinkerbloxsupport/arm-learning-path-support/main/static/images/Initialize%20_command.png)
+![Screenshot of the Uncloud portal showing the device initialization screen with the installation command displayed that you need to copy and execute on your target device#center](https://raw.githubusercontent.com/Tinkerbloxsupport/arm-learning-path-support/main/static/images/Initialize%20_command.png "Installation command")
 
 You should be able to locate and copy the specific installation command appropriate for your account. Here is an example: