The triangular numbers are the numbers of dots it takes to
draw a triangle using only dots, as the pictures below
show.  Each one has 1 dot in the top row, 2 dots in the
2nd row, 3 dots in the 3rd row, 4 dots in the 4th row, 
etc.  

                                                       .
                                         .            . .
                             .          . .          . . .
                   .        . .        . . .        . . . .
           .      . .      . . .      . . . .      . . . . .
     .    . .    . . .    . . . .    . . . . .    . . . . . .
 .  . .  . . .  . . . .  . . . . .  . . . . . .  . . . . . . .
 1  1+2  1+2+3  1+2+3+4  1+2+3+4+5  1+2+3+4+5+6  1+2+3+4+5+6+7
dot  =3    =6    =10 dots  =15 dots    =21 dots      =28 dots 
    dots  dots
  
So the answer to

triangular numbers are created by adding consecutive 
counting numbers? True or False?

is TRUE, provided you start with the counting number 1.

Edwin