From a practical standpoint that means don't buy status symbol products (cars, fancy phones, etc) - stick to practical (I drive a '98 Civic that cost me $2400 - great, reliable car). If you buy a house, buy a very practical one in a more affordable neighborhood. Learn to do your own maintenance. Keep your expenses as low as possible. If you don't have a Roth IRA start one today and begin fully funding it. If your work offers a Roth 401k option put some money in there too if you can.
And of course, always be learning new things.