I generally recommend the [Bogleheads](https://www.bogleheads.org/wiki/Main_Page) theory of investing. This involves investing in a few ETFs or mutual funds as a diversified portfolio. For example, a [3 fund portfolio](https://www.bogleheads.org/wiki/Three-fund_portfolio). I use [Schwab funds](https://www.bogleheads.org/wiki/Charles_Schwab), but any with low expense ratios will suffice. This is a set and forget strategy that requires very little work.
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I recommend the [Bogleheads](https://www.bogleheads.org/wiki/Main_Page) theory of investing. This involves investing in a few ETFs or mutual funds as a diversified portfolio. For example, a [3 fund portfolio](https://www.bogleheads.org/wiki/Three-fund_portfolio). I use [Schwab funds](https://www.bogleheads.org/wiki/Charles_Schwab), but any with low expense ratios will suffice. This is a set and forget strategy that requires very little work.
An important piece is figuring out your [asset allocation](https://www.bogleheads.org/wiki/Asset_allocation) for each fund. The simplest setup is just use a [target date fund](https://www.bogleheads.org/wiki/Target_date_funds), picking your expected retirement year. [SWYGX](https://www.schwabassetmanagement.com/resource/swygx-fact-sheet) is one such Schwab fund with a target retirement date of 2040.