The left hemisphere is specialized in speech and language in most individuals whether right handed who are the majority as well as most of left handed too ..
As for the right hemisphere it is specialized in visuospatial functions.
And that is why left hemisphere stroke is usually associated with aphasia and right hemisphere stroke is associated with sensory hemineglect or at least sensory inattention
also performs tasks that have to do with logic, such as in science and mathematics. On the other hand, the right hemisphere coordinates the left side of the body, and performs tasks that have do with creativity and the arts