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Originally Posted by MRM

Institutional investors seldom beat the S&P 500. If Donald Trump had simply invested his inheritance in an S&P 500 index account when his father died instead of investing it himself, he would be far richer today than he is. https://assetbuilder.com/knowledge-center/articles/THE_TRUTH_ABOUT_DONALD_TRUMP_AND_INDEX_FUNDS

The only good stock market advice anyone can give a lay investor is to have a diversified portfolio with your stocks in a low cost S&P 500 index fund.

Along the same lines, check this out. This plan promotes low cost index funds diversified globally and across different asset classes to reduce risk and increase return.
The Ultimate Buy-and-Hold Strategy