Handouts can be a wilful waste of your and other people's time, or a useful future reference and promotional tool.
To make it as useful as possible, consider it's current and future purpose. For example, 'current' as somewhere to jot some notes during the session; and 'future' to apply the models in the real world and to provide participants with a reminder of the key points.
PowerPoint has a Handouts function. It is great for keeping track of your slides, but not great as a handout unless you are very short on time to prepare handouts, and handouts must be provided. The ones that are available vary from 2 to a page, as shown on the right.
... to 9 per page, as shown to the left.
I suggest that a useful handout provides key content; provides your contact details; cross-references other useful resources; and is easy to read. I do these in Word, rather than PowerPoint. As shown below.
Be considerate of your readers when creating handouts. Provide a useful summary, and references for further reading if you can. If you are setting homework, don't forget to list it on the handout too.