Understanding Short Selling DAY 2

What are the pros to short selling? You can explode the returns of your portfolio if you believe a company is extremely overvalued. For example $Zoom Video Communications(ZM.US)$ $Fiverr International(FVRR.US)$ $Peloton Interactive(PTON.US)$ are all exceptional examples of overvalued companies last year that could have generated over 80% returns in 2 years.
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What are the risks of short selling? Unlimited downside potential, hard to borrow shares with some brokers, unable to borrow shares in retirement accounts, and at times higher fees.