"Goes" should imply some direction, so it rather cannot be a correct answer in such a short, vague sentence. But "on chodzi do szkoły" could be translated both as "he goes to school" and "he walks to school".

To quickly answer:

chodzić = the Simple versions (to go, to walk)

iść = the Continous versions (to be going, to be walking)

To be walking without a purpose and direction can also be "chodzić".

They are both imperfective, they don't say anything about 'reaching the place'. They differ in aspect: habitual vs progressive (Simple vs Continous).