In the rewards section when you are posting something you have three options.
- Power Up 100%
- Default (50% / 50%)
- Decline Payout
To understand what each of these does I am creating three posts each with one option. 
If you know what each of these options do and how to use them effectively let me know in the comments. If not I will share my learnings once I learn about them.
https://steemit.com/steemit/@gokulnk/what-is-power-up-100-in-rewards
https://steemit.com/steemit/@gokulnk/what-is-default-50-50-in-steemit-post-rewards
https://steemit.com/steemit/@gokulnk/what-is-decline-payout-in-steemit-post-rewards