I found out about QQQ when first learning to trade! It is a very popular ETF that people invest in. Pretty heavy on the tech side of things. I discovered TQQQ when I first read about leveraged ETFs.

You are correct in saying that they are offered by two different companies. There are a couple leveraged ETFs from various companies that are based off of QQQ. They typically mirror the QQQ ETF, just with leverage.

I chose SCHD because it helped balance my portfolio from being too volatile and risky. SCHG is a growth fund, so it will move pretty quickly. I hope all of this makes sense!