Apart from the right number of slides and slide complexity, there are some other common questions and considerations that come up in the world of keynotes and presentations;
What if someone wants to print the slides afterward?
If this is a legitimate concern, slides should not be altered with printing in mind. In fact, designing a slide deck with a mindset of someone printing it later goes against the reason we have slides, to back up what we are saying.
Slides should not be self-contained, you should not be able to print your slide deck and give it to someone so that can read what you said. If you want to be able to supply a hard copy of the presentation, create a separate document that has that aim.
Should I make my slide deck available for download after the presentation?
No! Again, the slides should not stand by themselves. Now, I will caveat that with the fact that you may have an audience that will leverage your content at a later time (eg. A sales organization going out to sell to customers after they hear your presentation about a product).
If that is the case, then please ensure you supply your slides with detailed speaker notes so that recipient understands the context of each slide.
Someone missed my presentation, and they asked me to send them my slides
Don’t do it. They won’t get any value from your slides alone, what they need is for either you to walk them through the presentation, or to watch a recording of it.
The best way of distributing your presentation is to have it produced as a video.
With the right editing, your presentation can be packaged into a consumable video (or series) that will engage audiences for years to come. Oh, and one last plug, I can help you with that too.