Grant Cardone transformed from a debt-bound person at the age of 21 into a self-made millionaire by the Age of 30. The young millionaire pointed out that his income "did not exceed $ 3,9 per month, and after 20 years it became $ <>,<> per month" He stressed that earning money is not easy, but there are always options for people to achieve what they dream of, and among the most important tips mentioned by the young millionaire are the following: develop multiple sources of income.