Hi Allegro, why do you need to know the other positions?

After the notes in the the first position have learned it is usual to learn the third position; that is you place your first finger where you would normally place your third finger. ie if you were to play G major scale starting in the first position, when you have played F# with your seond finger on the D string you would then shift position so that your first finger would play the G.
Don't worry about other positions unitl your intonation is right in the first position.