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REDDIT

Index funds, how do they work?

I have been learning more about investing. I have a mutual fund and a CD but that’s my extent of investing.

I want to invest in an index fund but am confused on how to choose an index and what I’ll decide to buy shares in.. it sounds like I can choose an asset type and company sizes???

Also, is an index fund something I can add whatever amount to it whenever I want? Or do I need to have a set amount of each of my paychecks going into it. Similarly, do I buy new shares of different companies every time I invest into it??

Any basic explanation in your own words on how these work is great. I’ve been reading all the things on nerdwallet but your own words might make it click for me. Thanks!! Hope my questions make sense 😅