> tell people what problem you're trying to solve

That's literally step one in OPs advice. It's just a pat way of conveying the "introduction > argument > summary" format for presenting and it scales really well from 3 slides to x.

1. This problem I'm trying to solve (i.e. I'm going to tell you how I solved this problem - Tell 'em what you're gonna tell 'em) 2. This is how I solved the problem (Tell 'em) 3. This is the outcome (i.e. This is what the solved problem looks like - Tell 'em what you told 'em)