HOW TO BECOME A MILLIONARE STRESS FREE
That's not too much of a simplification by the way. Just set it and forget it. Key is starting before you are 25 so you have a good 40 years to work the magic of compound interest. If you start later, you will need to save a higher percentage of your income and perhaps work longer than you intended.
Markets will go up during this time and they will go down dramatically every now and then. But sleep well, you will still eventually become a millionaire without the attendant stress.
Good sound advice. There are charts to prove it, so rest assured i's based on the science :)