• How to create systemd service unit in Linux
• Set systemd service to execute after fstab mount
• DigitalOcean Tutorials systemd:
  • How To Use Systemctl to Manage Systemd Services and Units
  • Understanding Systemd Units and Unit Files
  • How To Use Journalctl to View and Manipulate Systemd Logs
  • Systemd Essentials: Working with Services, Units, and the Journal
• NFS mount via systemd
• How to start systemd service after NFS mount in Linux

systemd-analyze – Find System Boot-up Performance Statistics in Linux

Some links:

• Arch Linux systemd/Timers
• Putorius Using systemd Timer Units to Schedule Jobs
• Linux.com Systemd Timers: Three Use Cases

• Freedesktop.org systemd.time — Time and date specifications and systemd.timer — Timer unit configuration