Early in your career, start by saving what you can, with the ultimate goal of putting away 15% of your salary. That 15% will put you on track to have the equivalent of your salary saved by 30, which is the milestone retirement-plan provider Fidelity recommends aiming for in order to retire comfortably.And if your employer offers a 401(k) match, try to contribute enough to qualify for the full amount, which is essentially free money.That means if you earn $50,000 a year, you should aim to have $50,000 in retirement savings by the time you are 30. If your annual...