What do you need help with?

https://github.com/cabaletta/baritone/blob/master/USAGE.md
Can we get more examples of the sel shift and help command examples?
I have tired to use the shift and the expand command and I can not find any examples online but every time it do it says an argument is wrong and I don't know what I am doing wrong.
I have tried the help command but the confusing bit the target and I think that what I have wrong.

help and aliases:
help sel - show help on the sel/selection command
help selection - show help on the sel/selection command

directions:
sel shift a up 1 - shift all selections up by one block
sel shift a down 1 - shift all selections down by one block
sel shift a east 1 - shift all selections east by one block
sel shift a west 1 - shift all selections west by one block
sel shift a north 1 - shift all selections north by one block
sel shift a south 1 - shift all selections south by one block

target selections:
sel shift a up 1 - shift all selections up by one block
sel shift all up 1 - shift all selections up by one block
sel shift n up 1 - shift the newest selection up by one block
sel shift newest up 1 - shift the newest selection up by one block
sel shift o up 1 - shift the oldest selection up by one block
sel shift oldest up 1 - shift the oldest selection up by one block

amounts:
sel shift a up 1 - shift all selections up by one block
sel shift a up 2 - shift all selections up by two blocks
sel shift a up 3 - shift all selections up by three blocks
sel shift a up 4 - shift all selections up by four blocks
sel shift a up 5 - shift all selections up by five blocks
sel shift a up 10 - shift all selections up by ten blocks
sel shift a up 50 - shift all selections up by fifty blocks
sel shift a up 100 - shift all selections up by hundred blocks

Thank you so much!