#1
i just started reading music and in one of the sheets my guitar teacher gave me i see tiny versions of each note on the left of each note... what do these mean?
#2
Grace notes. Almost like a mistake on purpose that sounds good.

They take up no time and are played extremely fast.

Several in a row is often called a turn.
#3
exactly what that guy said ^
If The Sun Refused To Shine
I Would Still Be Loving You
Mountains Crumble To The Sea
There Would Still Be You And Me

My Stuff
Gibson Les Paul Studio
Roland Cube 30X
Washburn Acoustic
Dunlop CryBaby