First position means to place your index finger in the first fret and the rest of your fingers in subsequent frets.  Second position means index finger goes in second fret, and so on.  

Generally first position scales also use open strings along with the first 4 frets.  Most beginner scale patterns are in first position.  These tutorials show beginner level scales in first position (C major and A minor).  Because you can play the same note in more than one place, they also cover how the notes can be played in higher positions.

https://www.guitartricks.com/lesson/13236

https://www.guitartricks.com/lesson/13240

Hope that helps!