I want to save and send money and recieve money i want all functions
Electrum has all of the basic functions, that are needed for sending and receiving bitcoins. It does not support multisignature and other advanced things, but those are not needed for using bitcoin on a daily basis.
so how can i transport my current wallet in bitcoin-qt to another client like electrum?
I hope that you have only balance on one address on your bitcoinwallet, if not then you have alot of copy pasting to do. Open up your bitcoin-qt and then do the following to import private key:
Open the following from bitcoin-qt: Help -> Debug window -> Console
Then unlock your wallet if it has a password:
walletpassphrase password 9999
And to export private key:
dumpprivkey yourbitcoinaddresswithbtc
Then it gives you a private key which can be imported to electrum like this: Standard wallet -> Use public or private keys and then add the private key(s) which you got from bitcoin-core. You are now able to spend the balance, but you need to only export/import the private key of the address that you have bitcoin on.
Open up electrum and make the following selections: