Explanation
When you close a Remote Debugging Connection while a debugging execution is in progress, the execution is stopped abruptly and an exception is thrown on the remote robot. The connection is then closed and you are returned to the Studio interface. (Debugging in Studio - UiPath Academy) References:
Studio - Remote Debugging
Debugging in Studio - UiPath Academy

Explanation
Triggers are a feature of UiPath Integration Service that allow you to react to key events in third-party systems, such as data updates, insertions, deletions, or custom events. By configuring triggers, you can start your UiPath processes automatically from Orchestrator when these events occur, enabling near real-time automation workflows across different applications. (UiPath Integration Service documentation1) References:
1: Integration Service - Triggers - UiPath Documentation Portal

Explanation
The TransactionNumber is a variable that stores the index of the current transaction item in the REFramework.
The TransactionNumber is incremented in two places in the REFramework:
In the RetryCurrentTransaction.xaml workflow, which is invoked when a system exception occurs and the retry mechanism is enabled. The workflow increments the TransactionNumber by 1 and sets the TransactionStatus to "Retry". This allows the framework to retry the same transaction item with a new index. (UiPath ReFramework documentation2) In the SetTransactionStatus.xaml workflow, which is invoked at the end of each transaction to update the status of the transaction item and log the result. The workflow increments the TransactionNumber by
1 and sets the TransactionStatus to "Successful", "Failed", or "BusinessRuleException" depending on the outcome of the transaction. This allows the framework to move on to the next transaction item with a new index. (UiPath ReFramework documentation3) References:
1: Robotic Enterprise Framework Template - UiPath Studio.
2: RetryCurrentTransaction.xaml - UiPath ReFramework.
3: SetTransactionStatus.xaml - UiPath ReFramework.

Explanation
Logging Level "Information" is used to log general information about the process execution, such as the start and end of a transaction1. When an exception is caught in a Catch block, the developer should log a clear message with this level to indicate the type and source of the error, and the action taken to handle it2.
https://docs.uipath.com/studio/standalone/2023.4/user-guide/logging-levels

Explanation
Click, Manage Packages
In the Manage Packages window, click Save
Search and Install the desired package
Click, All Packages
The correct sequence of steps to install a new Activities package in UiPath Studio 2021 10 is:
Click Manage Packages in the ribbon.
In the Manage Packages window, click All Packages in the left panel.
Search for the desired package in the search box and select it from the list.
Click Install and then Save to complete the installation.
Comprehensive and Detailed Explanation: To install a new Activities package in UiPath Studio 2021 10, you need to follow these steps:
Click Manage Packages in the ribbon. This will open the Manage Packages window, where you can browse, install, update, or remove packages from your project.
In the Manage Packages window, click All Packages in the left panel. This will display all the available packages from the official UiPath feed, as well as any other feeds that you have configured in the Settings tab.
Search for the desired package in the search box and select it from the list. You can also filter the packages by category, compatibility, or source. You can see the package details, such as version, description, dependencies, and release notes, in the right panel.
Click Install and then Save to complete the installation. The package will be added to your project dependencies and downloaded to the local cache. You can also choose to install a specific version of the package by clicking on the version number and selecting from the drop-down list.
References:
Managing Packages
Installing and Updating Packages