Google Slides Basics
Most if not all of the formatting tips for Google Docs apply as well to Slides.
Creating a New Presentation
Importing a presentation
*Keynote Users - If you use Apple's Keynote presentation software, you can export those as PowerPoint files then upload to Slides.
Choose a Theme and Layout
Adding or Editing Content to Slides
Customizing Slides
Creating and Arranging Slides
Presenting Slides
Using Q&A with Slides
Starting a Q&A from Slides
Presenting questions from Q&A
Voting on Q&A Questions