Some of the seed that fell along the roadside represents where 'the word' was sown [i.e., preached]. When these people have heard, immediately Satan comes and takes away 'the word' which had been sown in them.

and it happened, as he sowed [i.e., scattering the seed by hand], some of it fell by the side of the road and birds came and ate it.

And in the same way, some [of the seed] that was sown on rocky soil represented those who heard 'the word' and immediately accepted it gladly,

And other seeds represent those who are sown among thorns. These are people who heard 'the word,'