That Bitcoin is an opportunity to make extra income should be understood as not been in the light of getting some extra quick money because come persons will think of it that way, meanwhile they forget that volatility should make you know and understand that your make profit timely so there could and will be times when you are going to make even losses due to volatility,  so Bitcoin isn't some form of extra quick money but a good investment opportunity mostly for long-term.

Security of your assets in Bitcoin has got a lot to do with you. Ordinarily Bitcoin is built on a blockchain technology that is decentralised which gives it some good independent levels of security but it still hass some dependency on you and your custodial abilities and this has to do with the way you guard your details about your wallet,  if you share your details oit there without discretion,  you can get it compromised and this has nothing to do with Bitcoin been secured,  except you exposed your accident or wallet to compromise,  Bitcoin is safe in its own way.