Contrast effect is a huge one, understanding that people make decisions by comparing and contrasting their options. Demonstrations are so powerful in marketing and sales because of the ability to contrast before and after. The ugly jerry effect has got to be the lowest hanging fruit - applying contrast effect on your sales pages. If you n using contrast to fact, you're probably losing some really easy conversions.
Joanna Wiebe is the creator of Copyhackers and the Copy Chief at CH Agency.
For nearly 15 years, she has worked with incredible companies like BT, Canva, Glowforge, Intuit, MetaLab, Prezi, SAP, Sprout Social and VWO to optimize their copy.
Check out: https://copyhackers.com/