for example if your investment is on (BTC) make sure you have learn more about it.
But it always about risk and i do believe everyone knows whenever there's no risk no reward.
There is no risk in BTC investment if you're aware about personal wallets and how to deposit and save your bought BTC into a personal wallet. The risk is when you are trying to trade BTC on futures market because that's a risky thing and someone who does futures trading understand that risk is quite high when you set high leverage.
Bitcoin investment isn't risky if you're planning to hold the investment for long term as we all know that in long term Bitcoin holders will make profits instead of losses and the returns on their investment will be very high if they are going to hold their investment for at least a decade.
I agree with the notation that when there's no risk then there's no reward but when you know the risk is minimum and reward is high then I think you should go for it. In Bitcoin investment the risk isn't that high but the reward is pretty awesome and that's why I think one should go for it.
Those who invested in Bitcoin during 2014-2016 have made enough profits from it within few years and I believe the ones who are going to invest in Bitcoin today will surely make a lot of profits in long-term. It's a safe investment but only for the ones who know the technical aspect of the things. The ones who store their Bitcoin on custodial wallets are surely at higher risk because they can lose their Bitcoin anytime.
That's why I always recommend people to learn about the personal wallets and how to save ones private keys and seed phrases as that's most important for Bitcoin investors. I'm not sure about the ETF thing that what it would do with Bitcoin but if someone knows how to use software wallets and can create his/her own wallet and save his/her Bitcoin into that wallet then there is no risk in Bitcoin investment.