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If you don't have an emergency fund, I would put some or all of it into something like a money market account. It won't grow very much, but it's safe and is quick and easy to withdraw when needed.
Otherwise depends on your age and situation, but an index fund (S&P 500) is almost always the right choice. It's flexible, doesn't usually lock you in, and will generally do very well in the mid-to-long term. If we hit a recession you might get stuck holding the shares for several months to a few years. The last thing you want to do is panic sell in that situation.
If you have any debt, paying that down is a very smart move, especially if the debt is charging more interest than your investment can earn. Future you will thank you.
I have my emergency fund, and no debt. If I were to lose this $10K, it wouldn't impact my life. I'm comfortable with taking $10K out of my bank account and doing something with it but I don't know how to go about that. I don't know how to open an index fund or money market account.
Index fund, most definitely. And find one that has low administrative fees, I know that Vanguard has at least a few that are super low.