Batch processing for auto page orientation (on windows 10 using anaconda prompt)

[allenwalker753-ui]

Hello im new to this, and only know this from reading some youtube instruction.
i have succesfully installed ocrmypdf and can auto orientated single pdf file from anaconda prompt, here is the command : ocrmypdf --rotate-pages --rotate-pages-threshold 0 input.pdf output.pdf
the problem is i dont understand how to use the batch processing command
i see the documentation say using this : parallel --tag -j 2 ocrmypdf '{}' 'output/{}' ::: *.pdf .
but i dont know how to change the command to suit my use case, can someone tell me the command i need and explain it to me?