I recently found "ETF.com" to be a good starting point for investment research. I found "low beta" ETF's of particular interest. Low beta referring to low volatility.
I would suggest taking a look at BOTZ, one of the low beta etf's to which I referred. It focuses on AI and robots. It's a fairly new offering so I feel that I'm getting in on the ground floor.
I also find it helpful to research various ETF's in the same sector and compare the top 10 holdings and look for overlaps, the same company held by multiple etfs or mutual funds.
BTW, give serious thought about your time horizon for holding any investment be it a single stock, ETF or mutual fund.
My time horizon has changed from a couple of weeks/months to a couple of years generally three to five years.
Happy Investing. Due diligence is imperative!!!!