Bitcoin is a high risk investment, it not quite high risk investment.
Because it has a high risk, we are always advised to use safe money. It means the amount of money that we won't mind for the worse scenario (a loss).
Moreover, when we are a newbie, we may still have some obstacles and challenges to understand Bitcoin investment. That's why we are suggested to start with small capital firstly. So, when we get a loss in the early our journey, it won't ruin our motivation to keep investing in Bitcoin. While if we get a loss in a big money, I'm sure it can lead to exit Bitcoin investment forever (lost interest in BTC).
Investments, whether small amount or big amount, we never do with the intention of loss, but always for profit,Therefore, before making any investment, it is very important to know the risks and various factors involved in that investment. Losses are an integral part of every investment,but I think Bitcoin has the least risk of loss,but the condition is that if the investment is done at the right time.So before investing in bitcoin or anywhere else if you have complete knowledge and experience about it then investing with big money can be started. Most people suffer because of their own mistakes, so it would be wrong to criticize Bitcoin.
Newbies can also get discouraged if they invest in BTC at the wrong time. I think newbies should divide their capital into four parts and invest one part in the beginning. When the price of Bitcoin falls, the second investment can be made with a reasonable difference from the price of the first. therefore it is important to know about the investment percentage as well as the right strategy and right timing.