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Find a low-fee diversified index fund, such as from Vanguard. Take 20% or a reasonable portion of your income and place it in this fund with each paycheck. As they say, pay yourself first. Check out the Bogleheads' Guide to Investing for further information. That is literally all you need to know. I have earned the Chartered Financial Analyst designation over a rigorous course of study. This is literally what I do with my money.

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For a young person with a high paying job, 50% may be a reasonable portion of your income to save. Mandatory expenses will increase if you grow a family, possibly faster than your income growth.

And consider putting that money to good use -- improving the world, or rewarding people who are doing good work but not well compensated for it, or creating opportunities for other not-yet-wealthy people to have a chance at a good shot in life.

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