for what you can use angular service code example

Example 1: angular create a service

>>> ng generate service service_name
or
>>> ng generate service /folder-name/service-name

Example 2: angular new service

ng g s serviceName

Example 3: make service in angular 8

For Creating Service you have type command like below
ng generate service service-name
or
ng g s service-name

And if you want to make service into folder
ng generate service /folder-name/service-name
or
ng g s /folder-name/service-name