as any other currency has been created for expenses. however since there is not inflation you can even hodl and wait for better time.
the rest, the various altcoins or shitcoins are just a big risk and something truly different from bitcoin.
Isn't easy at all to understand, even because everyone is shilling their coin even because it's not easy to digest all subtle implications of an innovation like bitcoin.
Altcoins can be good to be invested when their is a bullish market, because i believe that all this shitcoins always give off on the way if cryptocurrency experience a bearish market, so no one can at this particular time cryptocurrency and especially bitcoin is experiencing constantly disvalue in the price.
I personally place bitcoin as an asset that I must have before other coins, say like ETH, BNB or other coins. I think it would be very unfortunate to hold other coins but not hold any bitcoins. For me whatever the amount is, I have to have it.
so that's the opportunity you can invest in altcoins and make profit, so that when invest and bullish market meet up the investment, it's the process whereby altcoins investment can profitable. But in terms of long term investments Bitcoin is the best among any other coins. I want to remind you that Bitcoin is the father of other cryptocurrencies and other coin's are subcoins.