One paragraph elevator pitch for the idea. If someone only had 30 seconds of attention, and this is the only thing they read to get interested, what would you tell them? Think about what key points might excite a prospective investor, and what about the "why" behind the idea makes it most compelling.
A good pitch deck tells a story. The story is the most important thing. Use these guidelines as points to touch on in your pitch deck, but they do not need to be relied upon as a crutch. The same goes for images; start adding graphics after you've already got your headlines in order. Images should be used as support.
Brevity and clarity are important, and remember, there is a difference between a sales pitch and an investor pitch. This should be a pitch to investors.
Common themes used in investor pitch decks: