Put in the maximum amount allowed. If you can't afford the maximum, try to contribute enough to maximize any employer matching funds. Study carefully the menu of investment choices. Some plans offer only a few choices, others may offer hundreds. The more you know about the choices, investing, and your investment goals, the more likely you will choose wisely.
Many companies match employee contributions with stock instead of cash.
Financial experts often recommend that you don't let your account get overloaded with company stock, particularly if the account makes up most of your retirement nest egg. Too much of a single stock increases risk. Plan fees and expenses reduce the amount of retirement benefits you ultimately receive from plans where you direct the investments. It's in your interest to learn as much as you can about your plan's administrative fees, investment fees, and service fees. Read the plan documents carefully.