Custom post format settings
Since you will most likely start your WordPress journey with the default theme--Twenty Seventeen, I should probably say a few words about one more box that's visible on the post editing screen--the one titled Format. We've already touched upon this briefly when talking about publishing videos and audio files along with your posts:
Some themes provide basic, ready-made formatting styles for certain types of posts. However, Twenty Seventeen isn't one of the most functional themes in this regard. In its current version, there's no visual difference at all between the various Format options. However, there are hundreds of other themes out there that support the Format functionality more broadly. Here are some examples derived from the previous default theme, Twenty Thirteen. First, we have a post saved as Standard:
Then the same post saved as Quote:
And, finally, saved as Status: