Although putting all funds in a single coin isn't a common idea, I think it is not a too bad idea. At least, you choose the right coin to invest in as a beginner. Bitcoin is the king of crypto coins, it has many advantages to consider as the main asset. Bitcoin is a crypto coin that influences the whole crypto market, its value usually has an impact on the prices of altcoins. Bitcoin is a coin that has the biggest market caps, it is the most favorite coin. Bitcoin is also the most paired in crypto market. Simply, we can conclude that Bitcoin is the most crucial coin in crypto world. According to these reasons, we know that Bitcoin is the safest coin to invest in. The price is also proven to always increase from one bullrun to another bullrun.
For newbies who are inexperienced and also do not have good analytical skills, choosing to focus on investing in Bitcoin is not a bad choice.
As you explained Bitcoin is the safest coin to buy by newbie, because the opportunity for the price to rise in the future is very large.
The problem is that newbies don't understand that they can't expect instant profits from Bitcoin, newbies have to learn to be patient holding
Bitcoin in the long term if they want to make a profit from Bitcoin.
In the end newbie must learn the crypto world well, to understand how Bitcoin works. So newbies don't panic when buying Bitcoin if it turns out
that the Bitcoin price suddenly drops, newbies should learn that the success of investing in Bitcoin is how patient they are holding Bitcoin.
That's why we find quite a lot of newbies who invest in Bitcoin in the end experiencing losses. Because they don't understand how to make a profit
from Bitcoin, so don't be lazy to learn the crypto world for newbies. At least a newbie must know Bitcoin well to be able to profit from Bitcoin.