Picking the right investments now could make a big difference when you look at your nest egg in 10 years.You don't have to pick individual growth stocks if you can load up on exchange-traded funds (ETFs) that are built to benefit from promising long-term trends. Fund managers charge their investors annual fees, but usually, those fees are reasonable enough that you won't notice them much, particularly if the funds in question perform well.However, not every ETF is a winner. Knowing how to distinguish the go ...