The investment game

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Ya but 25% to a millionaire is a sizeable chunk to invest with.

25% to a poor person leaves a small amount of money to invest.

Can you give me a specific dollar amount?

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That's a bit of an oxymoron dive.
Short term is gambling.Investment is a long term thing.
Short term put it in premium bonds.

@wolfe63 said
Index Funds.

Start soon. Stay informed. Diversify broadly.

Agree about index funds but diversifying is not easy.
In 2008 folks thought that they were well diversified having money in UK, USA, Europe, Asia, South America, Emerging markets, corporate bonds, property.
Blue chips, medium sized companies ,small companies, commodities.
The whole friggin lot crashed

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On a 1 or 2 year investment gold, silver and real estate are a no go.
6% per year would be a very good return.
I am sure that I could do it with investments in coins alone.
Mintage, condition and solid market research are the path.
I am sure because I have a slightly over 30% investment in coins right now and could liquidate for a 15% profit within a time frame over slightly over 2 years.

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99% are US coins. I know them much better.