Investing in Bitcoin is not a difficult task. But holding Bitcoin and profiting is bit difficult if some hone doesn't have proper knowledge.
Holding bitcoin is not also difficult when you know the appropriate thing to do, so people invest all their money and they are not thinking maybe emergency money will be needed. If you invest and you don’t have alternative money, then your mind will always be in the investment, and whenever any issues arise, you will end up selling your bitcoin and solving the problem. That's why I don’t recommend people invest all their money in bitcoin, they should always have some money outside bitcoin in case anything happens and you will be able to make use of the money.
But investing in Bitcoin is less risky than investing in all other cryptocurrencies.
Investing in altcoins is risky, and I don’t advise people to do so. When the bitcoin price dumps, if you can hold for a long time, then I am sure the price is going to bounce back, but there are some altcoins that will never bounce back after they crash. At the end, the coin will end up being worthless, and as we can see, a few strong coins crashed last year and lots of people lost their money in the crash. That's another reason for us not to invest in altcoins, there is nothing like a strong altcoin.