https://docs.servicenow.com/bundle/paris-servicenow-platform/page/administer/flow-designer/concept/spokes.
html
A spoke is a scoped application containing Flow Designer content dedicated to a particular application or record type. Flow Designer provides a set of core actions to automate Now Platform processes. You can add application-specific core actions by activating the associated spoke.
Reference: https://community.servicenow.com/community?
id=community_blog&sys_id=7b3af354db93ab80afc902d5ca9619bc

https://developer.servicenow.com/dev.do#!/learn/learning-plans/rome/new_to_servicenow
/app_store_learnv2_scripting_rome_debugging_client_scripts
The following are debugging strategies for client-side scripts, which run in the web browser and manipulate the user interface:
* g_form.addInfoMessage(). This is a client-side API that displays an information message at the top of the form.
* Field Watcher. This is a debugging tool that displays the current and previous values of one or more fields on a form.
* jslog(). This is a client-side API that writes a message to the browser console.
The following is not a debugging strategy for client-side scripts, but for server-side scripts, which run on the ServiceNow platform and manipulate the database:
* gs.log(). This is a server-side API that writes a message to the system log. References: Client-Side Scripting APIs, Debugging Client Scripts

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