To link a ServiceNow application to a Git repository, you need to provide the user name, URL, and password of the Git account that hosts the repository12. The URL is the address of the Git repository that you want to link to the application. The user name and password are the credentials that you use to access the Git account. Alternatively, you can use a personal access token instead of a password for increased security3.
References = 1: Link an application to source control - ServiceNow Docs 2: Publish an application to the application repository - ServiceNow 3: Linking an application to Git using a personal access token instead of a password - ServiceNow

Roles are used to control access to applications and modules in the application navigator. Each application menu or module has a role field that specifies which role is required to view it. Users who do not have the specified role or a role that contains it will not see the application menu or module. Roles can also be used to control access to other features and capabilities in ServiceNow, such as tables, fields, scripts, and workflows.
References = Enable or disable an application menu or module, Grant a role access to applications and modules, Controlling access to applications and modules.

The Field Watcher is a debugging tool that allows you to monitor the values of fields on a form as they change due to scripts or other actions. It can be used to debug Business Rules, Client Scripts, and Access Controls, but not Script Includes. Script Includes are server-side scripts that define reusable functions and classes. They are not associated with any specific field or form, and therefore cannot be watched by the Field Watcher.
References:
* Field Watcher
* Script Includes

"If there are no spreadsheets or existing tables to use for your application, you can create and customize a new table." see this quote in link below:
https://docs.servicenow.com/bundle/tokyo-application-development/page/build/app-engine-studio/task/create- table.html Also see:
https://docs.servicenow.com/bundle/tokyo-application-development/page/build/guided-app-creator/task/gac- create-table-from-scratch.html Also, no search results if search on "Now Experience Table Creator".

The ServiceNow platform is designed to create applications that use forms, workflow, and reporting to solve business problems. Forms are used to interact with data stored in tables, workflow is used to automate and orchestrate processes, and reporting is used to visualize and analyze data. The platform does not require low- level programming libraries or multimedia features, as it provides standard tools and technologies for application development.
References = ServiceNow Certified Application Developer Exam Specification, Application Development Platform - ServiceNow