The Beginner’s Guide to PowerPoint 2016
Printable PowerPoint 2016 Guide for Beginners
Tips for Solving Common PowerPoint Problems
How to Compress a PowerPoint (decrease file size)
How to Link Excel Data in a PowerPoint Slide
Top Ten Advanced PowerPoint Tips & Tricks
Don’t forget the old tried and true OpenOffice Impress – here is a wonderful tutorial for it. Download OpenOffice here.
margiegenereux.com 
ThinkFree (near the bottom of the list) looks good. It’s based on-line with no need to download the program. You may need to download Java to support it – so if you’re anti-Java this one’s not for you. They also offers storage space on their site for projects and documents. I’ll repost if it’s not as it seems. 🙂
A wonderful job. Super helpful infmotraion.