How to “Invest in the Stock Market”
So you don't have to hear “if you'd 'invested in the stock market' you'd have $ X now”
Say you have $12,000
Go to Fidelity dot com, open an individual brokerage account (it's easy)
Transfer the $12K
It's defaulted into their money market fund SPAXX which is earning you about $600 a year free. You're already better off.
Once a month, on a prespecified date (e.g. the 1st), buy $1,000 worth of an ETF called VOO. This is an “index fund.”
If you get more money, keep doing this. A prespecified amount on a prespecified day of the month- do not deviate.
You are now “invested in the stock market.”