Scrum on one page.
The official Scrum Guide is short. Its core fits on one page. Everything else is a practice you chose to add.
Product Owner
3 Accountabilities
Maximises value. Owns the backlog order.
Scrum Master
Makes Scrum work. Coaches team and organisation.
Developers
Build a usable Increment every Sprint.
The Sprint
5 Events
One month or less. Holds all the others.
Sprint Planning
Why, what and how.
Daily Scrum
15 minutes. Toward the goal.
Sprint Review
Inspect the Increment with stakeholders.
Retrospective
Improve how the team works.
Product Backlog
3 Artifacts
Commitment: the Product Goal.
Sprint Backlog
Commitment: the Sprint Goal.
Increment
Commitment: the Definition of Done.
Source: Scrum.org / ScrumGuides.org: The 2020 Scrum Guide ↗
Three accountabilities. Five events. Three artifacts. That's it.