Office 365 is now part of Microsoft 365. This also includes the PowerPoint 2021, the desktop version, for Microsoft 365.  

How to get started with PowerPoint 2021 for Microsoft 365?

Here is the step-by-step guide. It covers the following areas:

1. The user interface and general PowerPoint components
2. Creating title and content slides
3. Applying design themes to slides
4. Using Designer in PowerPoint 2021