Formally: ISO/IEC 20000-1:2018 ('part 1') specifies requirements for "establishing, implementing, maintaining and continually improving a service management system.
The 2018 version (ISO/IEC 20000-1:2018) comprises ten sections, following the high-level structure from Annex SL of the Consolidated ISO/IEC Directives, Part 1: ISO/IEC 20000-2:2019 provides guidance on the application of service management systems (SMS) based on the requirements in ISO/IEC 20000-1:2018.
ISO/IEC TR 20000-10:2018 describes the core concepts of ISO/IEC 20000, identifying how the different parts support ISO/IEC 20000‑1:2018 as well as the relationships between ISO/IEC 20000 and other International Standards and Technical Reports.
This part of ISO/IEC 20000 also explains the terminology used in the ISO/IEC 20000 series, so that organizations and individuals can interpret the concepts correctly.
ISO/IEC TS 20000-11:2021 is a Technical Specification that provides guidance on the relationship between ISO/IEC 20000-1:2011 and a commonly used service management framework, ITIL 4.
Qualification of individuals is offered by URS, APMG-International, EXIN, PECB, Loyalist Certification Services, TÜV SÜD Akademie, PEOPLECERT, and IRCA.
The EXIN, Loyalist and TÜV SÜD program is in fact a qualification in IT Service Management based on ISO/IEC 20000 and includes a Foundation level and several role based certificates: professionals in Align, Deliver, Control and Support, Associate, (Executive) Consultant/Manager and Auditor.
The APMG qualifications are focused on getting an organization certified and presume knowledge of IT Service Management is already available.