Highly upvoted posts normally get multiple awards.
This karma is divided between post karma, which is the total points of all the threads they posted, and comment karma, which is the total points of the comments they submitted to existing threads.
Being an active voter can help for everybody.
When Should I Upvote or Downvote a Post? The users of Reddit love great wit, so a successful attempt at being clever will normally yield upvotes.
Downvoted comments end up at the bottom of the thread.
In some subreddits, you might be banned for posting too often within the same time period.