ISO 9000 family overview (Quality management)
A clear, non-technical overview of what the ISO 9000 family is and how it’s used in organizations.

https://www.iso.org/standards/popular/iso-9000-family

Introduction to ISO 14001:2015 (EMS)
Short official introduction explaining what an EMS is and why organizations implement ISO 14001.

https://www.iso.org/iso/introduction_to_iso_14001.pdf