Usecase for overall scripting in servicenow

There are multiple scenario's , you can refer below examples
When user opens the existing incident and there is the parent incident of the same incident then there should be a message at the top “this incident is child xxxx incident” and when user click on parent incident number, it should open the same incident in new tab.
If the short description contain infra keyword in the beginning then category should add a new choice “INFRA” and set it to the same.
There is a field on a form you applied client script to make that field invisible then apply UI policy to make it visible? What will be the output ?
Create a business rule to Create a custom table(cust_incident) with two fields (incident_num, state), and whenever incident created, copy newly created incident associated incident_num, state values into the new custom table.
Create a business rule, Whenever a record deleted from 'cust_incident' table, delete corrresponding incident record from 'incident' table
OnChange: If Caller is VIP Then there should be an alert that caller is VIP and urgency should set to
High automatically
OnLoad Script : In Requested_for field, logged In user name autopopulate.
OnCellEdit Script : Start Date and End Date validation
OnSubmit : Start Date and End Date validation
Before: If the Incident state is new then user should not able to delete that incident.
Before: User should not be able to create new incident if the existing incident is there with same Short Description with Same Caller.
After: When Problem resolves, then its related incidents should also resolve and copy the cause notes.
Display: While Creating New Child Incident, Copy Fields From Parent Incident
if there are multiple catalog items with same workflow but every time description field is getting changed so in run scrip
activity how can we set it dynamically
Write a script on incident, so when user select "caller" it will throw alert as “Mobile no of user is XXXXX”.when click on "ok", mobile no. get populated in short description of incident form
OnChange Catalog Client Script if FirstName is Prasad and LastName is Dhumal, Email field should auto populate PDhumal@Gmail.com (First Letter of First Name + Lastname + @Gmail.com)
Calculate the number and return as duration : User will be entering the number on the form for example lets say 250,
based on the input it should convert this number into a time duration as 4 hours and 10 minutes.

You will find some scenario based challenges here : Are YOU a ServiceNow Jedi? - ServiceNow Guru

Also don't forget to check below links

Glide Record Scripting :https://www.shalamaster.com/GLIDERECORD.html

Glide Aggregate Scripting : https://www.shalamaster.com/GLIDEAGGREGATE.html

Client Script : https://www.shalamaster.com/CLIENT_SCRIPT.html

Incident-Problem-Change : https://www.shalamaster.com/IPC.html

Advance Client Script : https://www.shalamaster.com/Advance_ClientScript.html

Also don't forget to check this article by Ajim :

ITSM use cases (scenarios) for ServiceNow newbie developers - IT Service Management - Article - Serv...

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Astik