Retail giant Walmart (NYSE:WMT) was one of the best-performing stocks during the first half of the year. Year-to-date (YTD), WMT stock is up more than 32%, beating the S&P 500’s 14% gain.However, given the remarkable surge in value, many investment pundits remain skeptical about any further upside in the second half. Nevertheless, with its robust core retail business and fast-growing segments like advertising and eCommerce, Walmart still has much to offer. Thus, Walmart stock remains a buy, with plenty stil ...