The Complete Roderick is John Sladek's masterpiece.

Roderick is a robot who learns. He begins life looking like a toy tank, thinking like a child, and knowing nothing about human ways. But as he will discover, growing up and becoming fully human is no easy task in a world where many people seem to have little trouble giving up their humanity.

Roderick (1980)
or
The Education of a Young Machine

Roderick at Random (1983)
or
The Further Education of a Young Machine

SF Masterworks #45