It's shocking that most of steemians don't yet know what their news FEED is used for. Anyway this is not meant to be a long post, let's try making it short.
What is feed
If you are already fellowing some people (famous ones or educative and motivational ones or whoever), their recent posts are shown at news feed. These means you can easily get their posts when fresh, upvote it before others and get huge curation rewards.
For more rewards find who to fellow from trending and make sure their earnings are consistence, you are also adviced to follow educative and motivational ones like #learnsteemearn 
Once your login to your steemit account, rush to your FEED upvote new fresh post and smile.
Happy steemit
#learnsteemearn
@bestsmiles@bestsmiles