One thing I have come to observe in this crypto space is that: people always think the price of bitcoin is too expensive and they try to go for low cap coins that are still developing and will be hoping to cash out big in the long term and increase their bitcoin purchasing power, unfortunately, most times these altcoins that were predicted to grow do mess up investors plan, and instead of them to buy bitcoin this time after the first disaster, they chase another promising altcoin and end up been disappointed, by the time they are set to buy bitcoin their money would have been burnt by shitty new coins. That is a rat race.
One thing I've just noticed and observed is that, most of the newbies tends to be excited and without a strong foundation to the decision that they are making. You're example OP is the perfect example since I as well fall to buy short term promising altcoins before where in fact, I've already invested in bitcoin in the first place.
So which coin do you first advise your student to buy as the learning progresses?
Honestly, I couldn't advise that it should be bitcoin, though, they will really learn about investment if they lose allot in investing in crypto for the first time. What I could suggest is that, they should first try altcoins such as Ethereum and XRP, because Bitcoin for me is the real deal, the application of your knowledge from investing in Altcoins will be your way to earn profits in bitcoin.