The first step is to decide what you’re saving for, e.g. retirement or a child’s education. You may need help deciding how much you need to save for your goal, although that’s beyond the scope of this web site.
Here are some useful financial planning calculators that can make that analysis easier. It’s fine to have separate portfolios for different goals, e.g. one portfolio for retirement and another for the purchase of a house.
Retirement Planning Websites: Vanguard Fidelity Motley Fool