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EDIT: Also why should I create new receiving address each time? Why I can't use the same addres to receive bitcoins each time just like on blockchain.info?
EDIT: Also why should I create new receiving address each time? Why I can't use the same addres to receive bitcoins each time just like on blockchain.info?
You can use the same address. It improves your privacy and security slightly if you make a new address for every new input.
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there is already address added but I didn't add anything, so It ok to use that address?
there is already address added but I didn't add anything, so It ok to use that address?
Yes, you can use this address. But you can only spend the coins if you wait untill bitcoin-core has fully downloaded the blockchain. You can however see the transaction on any other blockexplorere (like blockchain.info etc.)
And each time I create new label new random address adds up but I can't choose myself the address.
The wallet has 100 addresses generated for you and is showing them one after another. "choosing" an address is not easy. See vanitygen for that. It will use your CPU power to try to make a very specific address. Which can take ages depending on what you want, just stick with random
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also If I receive my bitcoins from blockchain.info to 5 different addresses my balance on bitcoin qt will show total sum of all bitcoins I have on all the addresses?
also If I receive my bitcoins from blockchain.info to 5 different addresses my balance on bitcoin qt will show total sum of all bitcoins I have on all the addresses?
Yes, the wallet total will show the sum of all addresses. Or to be more precice of all unspend inputs.
And If I want to send funds to other person he would receive the funds equally spread from all my 5 addresses?
No the wallet will pick smart which address to use or you can enable "coin control" (see: settings -> options -> display -> [] display coin control features (experts only))
Coin control allows you choose which inputs ("receiving address") to use as an output when you send coins.