of course if you have all your funds in one wallet you can lose it all, don't matter if is a company with a great brand, the online wallets always can be hacked. Just look bitfinex thats a great example why you can't have all your funds in one exchange.

If we dont risk a bit we wont get any new bitcoins, we do need to trade or invest our bitcoins into exchanges and casinos or dice, let them stored makes no sense at all. Sure the bitcoins should be at more then one place but sometimes its better to be at one place.

It is not always to put or store coins on any exchanges online.Yet it is still better if you will still store your coins on a wallet that you hold the api and private key so you will feel secured even though  you leave it just right there for a long timem but putting 2FA on accounts on exchanges will help a lot on securing stored coins

Blockchain is the best. Although disk or paper wallet is in our direct control. also the security is depend on us. No matter how we safe our money in there but I still think that blockchain is the best, blckchain is the most practicaly wallet. It is have mobile  user interface that easy to use. Never safe all of our bitcoin in exchabge becouse it is different with wallet. The exchanger can be close or hacked any time. But if we safe our bitcoin in many wallet it will reduce the risk of hacked. To avoid hacker we need to safe in paper wallet or disc but it is not practicaly to use.

I had invested $120 in yobit and bought blry coins so how can i transfer those coin from yobit to my blry wallet is there any official wallets for bitcoin. I understand the risk of stories coins on exchange sites but many of my friends say that it's safe to store coins in exchange sites. I am in a dilemma

If  you have  blry  wallet  you could actually transfer  your  blry from  yobit    to blry wallet  itself     its possible. Same as  others said    here  that   keeping   huge money   on exchanges  would  be  somehow risky     because  of  some  exchages hacks , to be safe better  to store   small  amounts of money.

better you sell your coins first and after you have bitcoin, then you can send it into another market so you can start to trading with other coins too. maybe you can't make your bitcoin as first in $120 but at least, now you have bitcoin and you can do whatever you want.

i think there is  nothing wrong to put coins in an exchange

My friends says that exchange sites are safe and we can store our coin safely in those site. But i had argumented with them that it's not safe to keep coins with exchange sites, they could run away anytime or could delete my account our alter my coins but they said NO it's safe to use exchange sites. I am too in dilemma.

Same as never keep all of your bitcoin in a single wallet. We can't really say what will happen to them tomorrow so it's better to divide them so it would be that disappointing if something happens in one of that exchanges or wallets.