As I've said earlier, investing little in BTC now won't give you a tangible profit when the profit comes but its advisable to invest 20- 40% of your capital in my opinion .However as a beginner or newbies, you literally know nothing about investing even if you have an idea you are still new to it so it is advisable to start with little amount to understand how the game is being played before considering any percentage to add in your investment and this should be strictly done according to your capital.
Newbies and professionals both need to invest the amount they can afford to lose. We cannot say that because someone has already been in the market for a long time, they should invest a large amount of money, or we should say that since someone is new to the market, they should invest a small amount of money. Both can result in losing or making a profit, so the only thing is to invest the amount you can afford to lose. Don’t say that because you are already professional, you will invest a large amount of money. Remember that no amount is small when it comes to investment. What you consider is yourself. Make sure you don’t invest and start having financial problems. You will still go back to what you have already invested. But if it’s small, you will hoard for a long time and get your profit when the target is reached.