The story with Bitfinex teached all of us that it is too risky to hold all of your coins on one exchanger. Thanks God I wasn't holding my bitcoins there. I use Yobit and Blockchain. I like Yobit the most it is very easy to use and the  page is in different languages that is very useful if you are not so good in English.

Would you guys recommend storing your coins on myethwallet? They allow storing different kinds of coins as far as i know. And so are shapeshift. Storing coins in these app can help me access them anywhere with just my Tablet.

Not sure what myethwallet is, is it an online wallet service? I couldn't find a website or Android app for it, I'd be careful about using obscure apps/services. If it is an online wallet service then I would suggest that you have a look at Coinbase instead, they are trusted, regulated and provide insurance against hacks and thefts, plus they have mobile apps. I've been using them for a long time and have never had any problems. And since they're an online service, you'll be able to access your coins from any device without needing to install an app.

Indeed for us to avoid a victim of a scammer, just every time we earn in the different exchange platform  we should transfer it at once into our local bitcoin wallet address.

That's right, because they have a brain for think about that and not all people is always ever having experience about that, and I think there are a people just seeing about the experience for another people for them to learning about that.

The problem is hackers always try to hack a exchange' cold storage wallet for the simple reason that they can easily earn a lot of money doing so, so while the exchange might not really intend to scam still they might end up scamming because of the hackers being always irritating them and sometimes even succeeding.

exchanges being hacked or gone scam is a bad point in bitcoin reputation because people think bitcoin itself has something to do with these accidents. it only individuals fault that they trust those sites

Yeah... I've experience this when my first time knowing about exchanger. I was keep my fund on mintpal , the great exchanger just like poloniex and bittrex. I wasn't being expect that great exchanger can be down vanish. So from that day, I have transfer about 75% stored coin on my current exchanger ( poloniex and bittrex ) into my local exchanger

I have some coins on my exchange but these are not all on one exchange these are on different exchanges in little amounts so I do not have any fear to lose them as it will not be such a huge lose for me relative to my other bitcoins on my wallet.

Technically, blockchain.info would be the safest of those listed (based on the ones I know), as you can get your private key. That said, you will never be safe unless you hold your coins locally and keep them highly protected. No online site is going to change that.