In that order of ideas, if someone asked me where to invest then I would likely present the pros and cons of those altcoins in the top 10 and also the things one needs to keep in mind while holding Bitcoin. In the end, it is better when people invest in something their actually believe in and not only because someone gave them unprofessional advice.
You are correct, we should always teach people and allow them to make their choice. But for record purposes, I have never taught anyone about cryptocurrency and begin to mention alcoins. I don't even mention them individually. I will only say that there is bitcoin and there is altcoins which includes Eth, Bnb, dodge etc. That is the extent that I go.
If the person insist I should tell them where to invest, I'll tell them where I invested, which is in BTC.
Anyone I'm BTC should not have the mindset of getting rich overnight. If anyone has such mindset, let them invest in altcoins and shitcoins, they could become overnight millionaires.