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Given advice “buy term insurance and invest the rest”, how should one “invest the rest”?
Buy term and invest the rest is in fact the easiest plan.  Just buy the term insurance based on your current and expected needs. Review those needs every few years, or after a life event (marriage, divorce, kids, buying a house...) For the invest the rest part: invest in your 401K, IRA or the equivalent. There are index funds, or age based funds that can help the inexperienced. Those index funds have low costs; the age based funds change as you get older.  The biggest issue with the whole life type products is that what your care about for the term insurance doesn't mean that the company  has a good investment program. You also want to have the ability to decide to change insurance companies or investment companies without impacting the other.