Received $30K from divorce and looking for best option right now - any suggestions?

The only thing more volatile than the market has been my marriage, and ending as amicably as possible, I received a small check for $30K as settlement to close the chapter.

Partner has always led the finances so I am looking for a safe, *set it and forget it* investment. From my research, it looks like total-market, index-based, low-cost mutual funds are suggested if I wouldn't be needing the money for 10 - 20 years down the line. Just a bit torn between choosing Stock Market, International Stock Market, or International Bond Market..

Lately, various investment subreddit's been all about how the financial institution is collapsing and I should just hold onto as much cash as I can. So definitely have my doubts.. but I've been lucky enough to hold onto a decent paying job and putting aside money into savings, etc. and won't make any further drastic life changes..

Been a tough past few months so would love to get some insight from folks as I embark on the financial journey alone.. thanks in advance!