How safe is it?
Yes it's good.to invest in bitcoin but to think that is safe no one know what will soon to happen so I cannot answer it . scare of investment will not get you rich. And one more thing bitcoin it self is an investment another thing you can use bitcoin in many investment trading,gambling,lending and many more so don't be scared if the price will increase decrease just invest what you can afford to lose.
If you believe the bitcoin price will rise in the next few decades, it is better to buy some bitcoin now and hold.
yeah you can use a lot of investment if you're using bitcoin there are many methods you can do with bitcoin including growing with a secure method invest in bitcoin not only hold bitcoin, there are many methods other than that such trading, cloudmining, etc and so forth, buy now is not a problem because you can still grow and a profit,,