Use templates from SlidesCarnival.
You can cut and paste a slide from one presentation to another.
You can change your slide background to an image of your choice.
You can also put an image into a shape.
You can change the order of your slides by dragging them in the left-side toolbar.
You can easily delete, add, duplicate new slides.
When in Present mode, videos can play easily within the slide (no need to go to another video link).
Lots of Slides templates live on Sharing page!
You can create an interactive table of contents on your first slide, linking to the other slides in your presentation.
You can dictate your presentation text with the Voice tool.
Don't forget those privacy settings if you want to collaborate or share with others.
You can use the Revision History to see a previous version of your presentation.
You can embed your slideshow easily on a Google site.