Hi, I saw the following explanation about alias in bash from gnu website, but I didn't get the meaning:
Bash always reads at least one complete line of input before executing any of the commands on that line.
Aliases are expanded when a command is read, not when it is executed. Therefore, an alias definition
appearing on the same line as another command does not take effect until the next line of input is read. The
commands following the alias definition on that line are not affected by the new alias. This behavior is also an
issue when functions are executed. Aliases are expanded when a function definition is read, not when the
function is executed, because a function definition is itself a compound command. As a consequence, aliases
defined in a function are not available until after that function is executed. To be safe, always put alias
definitions on a separate line, and do not use alias in compound commands.

especially the part related with function, can anybody help explain in short sentences cause I am not a English speaker.
Great Thanks.
Roy987