Field Service Lightning in Salesforce lets customer service teams delegate work to field service technicians and monitor them and lets the latter access customer records in the field.
“Field Service Lightning connects your entire workforce on one platform to deliver smarter, faster, more personalized on-site service to your customers.”
Links for certification preparation:
Trailhead Trailmix – https://trailhead.salesforce.com/users/00550000006GZXcAAO/trailmixes/field-service-lightning-certification-fast-path#
Salesforce Help Resource – https://help.salesforce.com/articleView?id=fs_overview.htm&type=5
How to enable Field Service in Salesforce? – https://www.infallibletechie.com/2018/12/how-to-enable-field-service-in.html
Create Work Orders – https://help.salesforce.com/articleView?id=fs_create_wo.htm&type=5