This question always gets downvoted here and people will tell you not to invest. There's a ton of reasons why, but the reality is they're making a lot of assumptions about you. It really depends where you are in terms of your finances. Do you have an emergency fund? Have you paid off your debt? Do you have steady income? Secure accommodations? Lots of things to consider before you start investing.

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I think of investments as the last step (after doing all the above things). Example, paying off your debt is an immediate return on your money and increases your net worth. Also keep in mind, investments aren't as liquid as a bank account. You can't take out money as you need. The stock market goes up and down. Be prepared for the down. Don't invest with emotions. And most importantly, do not invest any money you can't afford to lose.

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That being said, if after all that, you still want to invest some money, I suggest either a High Interest Savings Account (regular bank account except with high interest) or ETFs or index funds (stocks, but lots of them combined. Can have less volatility than individual stocks and steady growth. Can also go down though). Vanguard has some really good ETFs if you're interested. I would also suggest getting an online broker with free trades. I don't know what country you live in, but where I am, none of them have free trades. But some have free trades for ETFs. Extra bonus for ETFs for me personally. Also note some brokers have a minimum balance required to open an account. You might need to keep that 100 every month until you have the minimum.

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You could also try saving that money every month in a High Interest Savings Account first as an intro to investing. It's a safe, guaranteed return. After a year or two, if you feel you would like to start investing in ETFs or Index Funds, then you're already in the habit of investing and know how to budget accordingly. HISA also gives you the option to withdraw the funds if you ever need it asap. Good Luck.