No one can get rich overnight by investing there is risk. As far as I'm concerned holding bitcoins involves people's own decision and it's not possible to get money from here in a day, it's a long term wait. Don't think of bitcoin as the only source of income. Besides other means of income, bitcoins should be invested based on own money. By holding bitcoin, there is less risk of loss and profit without any challenge if the price rises.
Some people are also involved in trading with altcoins but they face troubles when the price suddenly goes down and altcoins also possess risk. Now a days one can easily buy and sell altcoins as price is regularly fluctuating and at the same time one can hold bitcoin so he can get profit from both trading and investment in current Bull season.
If they don't want to make their life hard they must eliminate the thoughts of trading altcoins since it will just give them a stress especially these tokens is usually so unpredictable and might they lose their money if they pick the wrong positions or just got FOMO on the tokens they bought.
But if they want to stay intact and get less stress then I guess going to invest on bitcoin for long term maybe best solution for them they just need to look up the price history of bitcoin and for sure they can able to know how big the potential of bitcoin to hold for much longer years. Data's about it is available online so if they could just read a lot of information about it then for sure that they can learn a lot from it and can able to do good decisions upon what's good investment for theirselves.