bitcoin address after transaction security questions
1.) Is it safe if I create a raw transaction on the offline computer so I can execute it on my online computer?

Yes, this method, called using cold wallets is very effective at keeping coins safe.

An address either never spends (the public key is not revealed) or it spends (the public key is revealed). Spending fewer times from an address won't make it less secure (unless you use very old or home-made signing code). And the security difference between non-spending and spending wallet is negligible. (Otherwise, there would be a price crash and chaos)


Every input has its own signature, not every output. So, by making all those payments at once, you'll save lots of $ in transaction fees.