+ eleventy in simplifying The three-fund portfolio is a great place to start. You can also google simple mutual fund portfolios and there will be many options, but that might actually be overwhelming. There's no good reason not to stick with the basic standard. That's a set-it-and-forget-it answer (minus occasional rebalancing, like maybe 2x per year, and only if a category is off by more than x% do you actually sell, otherwise you just adjust future contributions). For someone who wants a solid asset allocation that they don't need to think much about, it's great.
You would probably also benefit from doing an IPS (Investment Policy Statement). Google for examples, and search this forum for more info, but in a nutshell, you sit down and make all the decisions you need ahead of time, so you aren't trying to do it when you are looking at scary losses or huge gains, or when you are emotional about money. You decide where you money will go and what conditions will trigger actions. Then you just enact the plan, whether the market is up or down, whether you inherit $500k or lose $100k, whatever. It doesn't need to be long, though some people's are. Just enough that you make solid decisions that guide you when you otherwise might succumb to emotions.
