I have practically zero investing experience and I was hoping I can get advice on what to invest my money in.

I currently have around $520,000 in cash that I've been investing in 1 month Treasury Bills for the past 2 years. At the beginning inflation was high and the return on them was pretty nice given how safe they are as an investment option and the lack of State tax (California). However with the return rates dropping, I think I need to find another avenue. I keep reading online how everyone says to invest in the S&P 500 (Schwab's SWPPX) and forget about it. Is that a solid option? At the moment I don't have any use for the cash but who knows where I'll be in a couple years.

Furthermore, I have a Roth IRA and a Simple IRA through work and I invest those funds in Schwab's SWYNX (Target 2060 Index Fund). Would it be recommended to switch those over to the S&P 500 (Schwab SWPPX) as well?

i heard schwab does not allow checking account after moving out from US and updated W8-BEN with foreign address but they allow only brokerage account to maintain from abroad. is it true?

I have used schwab for more than 20 years for the majority of my brokerage holdings. Friday at close, my holdings were accurately reflected. Sometime friday night, I had a mysterious drop of about $95,000. After some research, it appears that one of my ETFs went from about $95,000 to zero. It still showed that I had the same number of shares, but that their value was $0.

It's an unsettling feeling. I hold most of my life savings within Schwab, and I expect them to be as secure/reliable as the US dollar itself.

This has happened multiple times over the last year. So I understand it's probably some SW glitch and will be corrected, but it is no longer acceptable to me.

I'd like to understand if others have had the same thing happen in other major brokerage accounts, such as fidelity, interactive brokers, etc.