Marc Lore's first big startup sold diapers, and it was bought by Amazon for more than $500 million. Instead of celebrating, Lore felt a let down. After Amazon, he went on to found a competitor, called Jet.com, which he recently sold to Walmart for $3 billion in cash, plus stock. This time, he's had a number of reasons to celebrate. Now he's the president and CEO of Walmart eCommerce in the U.S. The stock is way up. On this episode of "Success! How I Did It," Lore describes how he founded several companies with his childhood friends, and what made the Walmart deal different than Amazon's.