This is its simplest form means "he goes". Should one wish to say "he walks", wouldn't the more exact translation "הוא הולך ברגל" be more appropriate?
It can also mean "he walks". You can use הולך or you can say הולך ברגל if you want to emphasize that he is walking on foot or to clear the ambiguity.
I am a bit disappointed because new words come up and I haven't been introduced to the word before.. what should I do?