About the Percona Backup for MongoDB category

Percona Backup for MongoDB is designed to give you an easy command-line interface to perform a consistent backup/restore of both clusters and non-sharded replica sets.

I didn’t understand the initial installation and configuration steps it is very confusing and very complex. In the official docs it is written to write in the pbm-agent.service file but where to create it and under which section should I need to create it are not specified so kindly can anyone help me in this regard on how to use pbm

Warm Regards
Gousik Rao N