All the answers I see here are just confusing me. What is a ' client '? Is it me, my computer, my online wallet, the person selling to me or buying my bit coin or what ? I just want to know how to send bitcoin from paper wallet to online, to spend, and what to do to avoid losing the change remaining in the paper wallet. I GUESS it is like this...empty the paper wallet to an online wallet. Pay the other party by sending off bitcoin. Then make a new online wallet - must I ? Put the remainder bitcoin in there Make a new paper wallet.Send remaining coin back to new paper wallet. Sounds simple? But I have NO IDEA about how to use the private and public keys. Do I have to make a new private key for every step in the above ?
send to online wallet ie spend bitcoin from cold paper wallet ,without losing the remainder
Client normally means the wallet
You don't need to give money to someone to make you a wallet. There are many free wallets like electrum , greenwallet, coinomi which create a address for you and also make you the owner of your private keys
You also don't need to send the money from your paper wallet . If you are able to destroy you paper wallet safely , you can sweep the bitcoin from your paper wallet to coinomi wallet .
No need to make a new private key every time .