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is coinbase.com is good site i have heard that site is not working properly...? is there any other site we can get good wallet without any problems......?
I would highly recommend against using a web wallet due to its inherently insecure nature, but if you have to I'd say go with Blockchain's one - just make sure you add 2FA and have a secure password.
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I'd second the tips here.
I'd only say use BlockChain.info to test out Bitcoin. At some point (or when you have enough funds you aren't willing to risk) I would switch over to something like a paper wallet.