You shouldn't encourage beginners to buy at an ATH, Bitcoin is a very volatile and risky asset actually. Nobody knows if trump will respect what he said during his campaign in addition, so Bitcoin could stay at this level during a long time as long as people hope pro-crypto measures to take place and then decreases and dips when they will start to lose hope or it can even drop overnight if some bad news or anything else happen. I don't think Bitcoin is an asset meant for beginners, even when it is a more normal leval, so beginning with Bitcoin at its ATH, doesn't seem to be a good advice actually.
No way you just said Bitcoin is a very risky asset just no way, when you're taking about crypto assets that got very high risk you should be referring to shitcoins and not Bitcoin, you'll only lose in Bitcoin when you're using wrong strategies to accumulate it, like trading or gambling with Bitcoin to get more Bitcoins.
From what I've learnt so far, I think Bitcoin is the safest asset anyone could think of investing on, all you need to do is to buy and hold for a longer period, moreover it's volatility is not a very big deal so far you invest consistently and use good strategies for instance the dca to help recover lose.
Also, so far a beginners have learnt the features of Bitcoin and understand it very well then no laws hold them from investing on it, all they just need is thinking long-term and buying continuesly to add to their holdings, it doesn't matter whether they start now or not the goal should be holding for longer period and buying continuesly.
Among all the cryptocurrencies, Bitcoin is the safest with less risk. It also have a lot of risk invove, but holding Bitcoin is the best form investment in the whole world not just in crypto space because it is only Bitcoin that will give you financial freedom, profit, and still save you from inflation. Holding Bitcoin for very long time is the best form of investment because if you looked at how Bitcoin start back then in 2009 till date, you can see the progress, and how much people that are still holding Bitcoin has made from the investment.
Altcoi can actualy give some quick profit, but it is very risky because just as it can give you good profit, it can as well drag you back tio squre one by given you a huge lost. However, to be safe in the crypto space, invest in Bitcoin.