Another important thing is that the investment is largely risk-free and you should invest the amount that you can afford to lose.
This statement from you is confusing.
Bitcoin is not risk free.
The advise about investing an amount that you "can afford to lose" is advice given to show that the investment (including an investment in bitcoin) could go to zero, so when you invest, you are choosing to invest into bitcoin from extra money that you have, and you are aware that you could lose up to 100% of your investment amount.