I learned from various forums on internet.
There is no easy answer to this question yet I have found that while you are looking for your ideal stock portfolio, or other investment choices the best option can be total world stock market ETF by vanguard — ticker VT.
I prefer to park my money in VT for the time when I am not sure of where to invest it immediately. It works out to be a better choice as compared to keeping cash.
I use M1Finance for ETF investing and ETRADE for stock trading.
This is not an investment advice.
Do you own due diligence.
What is your favorite ETF?