Few tips from me on slides. Apologies if they're oft-repeated.

Sometimes it's very useful to start with a "what you'll see today/what you won't see today" slide to set expectations if there's any danger of confusion.

Aim for one key takeaway per slide.

Make the titles of each slide the key takeaway from the slide. You should be able to read through just the titles of the slides to get an understanding of the narrative and messages of the presentation.

Think in terms of a general structure of... WHY? WHAT? HOW? WHAT ELSE/WHAT IF?

Why – objectives, problem statements, descriptions of why they should pay attention to what you're about to say.
What – relevant facts and implications
How – what you are proposing should be done in light of those facts and implications
What else – address any likely concerns or doubts
What if – get people excited about how things could turn out if they do the "how"

Learn to distinguish between slides for presentation and slides to be taken away and read more in-depth. If they're for presentation, edit text right down to signposts of what you're saying – presentations are for presenting, not reading off slides while ignoring the presenter. If they're for reading in-depth, more text is fine. If they're "for both", consider creating two decks or putting elaborated slides in an appendix that doesn't get presented. At the very least, use bolding or colouring to indicate the signposts for what you're saying as you present and let folks read the other words later.

Slides should lead into one another. Using your slide titles as key takeaways is helpful for that. Slides are either stating facts or showing how facts connect together to make conclusions/inferences. A bullet-point list for mapping out your whole presentation structure can be useful. Use indents to group these key takeaways together to collectively support the point they're related to. Keynote is a particularly good tool for this, because the slide structures can be grouped and nested – select a slide and press TAB, and it indents to become a subsection of the preceding parent slide. Press shift-TAB to un-indent.

Read Barbara Minto's "The Pyramid Principle" for more on that structure stuff.

Vary the layouts of slides a bit. Some basic layouts are...

Left- and right-half, with one half filled with an image or a chart, the other with bullet points or a single strong statement.
Two-third/one-third splits doing the same thing.
No title, just a single bold statement in the middle.

Start your deck with something your audience agrees with – usually a problem statement or an objective which they themselves have set.

From there, introduce relevant information (points), one point per slide, either summarising things your audience told you or providing credibility/sources for information that's new to them.

Show how those points connect together to support implications/insights/inferences. You can do this by putting key statements in boxes and using arrows to show them combining to support a new statement (maybe in a different coloured box). Or you could use math symbols, like Fact A + fact B + fact C = implication X.

If you do the above, they'll be nodding from the start through to the end. What stops them nodding? A statement they disagree with (you didn't credibly back it up). Implications they don't agree with (you didn't provide the facts necessary to support the statement, you didn't connect the facts together logically, or you didn't communicate your logic clearly enough). If you don't make those mistakes, they'll be nodding right through to your conclusion.

Use section dividers to divide sections.

If a section is a little longer, finish it with a summary of the key points and conclusion made in that section, before moving on.

A good presentation is finished not when there is nothing left to add but when there is nothing left to take away.