While reading about the fees here https://metamug.com/article/security/bitcoin-transaction-fee-satoshi-per-byte.html
The article said that "In the simplest case, you'll have one input and two outputs (the recipient, and change). So in=1 and out=2."
Does that mean that I cannot send the entire amount from one address to another? I thought that the simplest case is
out=1. And that
in = out + fee