Many people advise newbies to invest only what they can afford to lose but I have done this a few times before and as time goes on they get tired, if I ask them why they reply, 'I don't know it's going to take this long, I have come to realize that telling newbies to invest only what they can afford to lose is incomplete because they don't know how long it will take anyway and most aren't prepared for that.
Instead, I tell them to invest the amount they won't be needing for the next 5+ years, this prepares them mentally and physically, and those that are weak will give an answer instantly saying no way.
It is better to advise them to invest only what they can afford to lose to do risks the Bitcoin investment involves especially security purpose, when you don't have much knowledge as newbie how will you provide your Bitcoin investment with strong security against scammers, so all this risk is not just about the price alone. So advising newbies that they can invest the money they don't need from now to 5years in bitcoin maybe so risk because nobody know what the future will come up with so don't assure anybody.
I don't think it is necessary to in invest in Bitcoin when you have not gather good knowledge about it. Don't be too greed to invest in Bitcoin because you think others are making profits from it by investing what you can afford to lose. Always know when you have good knowledge about something it will always be easy to handle. Crypto is not a rush investment many have failed in crypto industry due to that they want use the Bitcoin price opportunity but now they can't access their wallets again because scammers have take it over from them.