How to use Keyword based classifiers - Invoice and receipt AI processing

Hi team,

Anyone help me that how can i use keyword based classifiers inside the Classify Document scope or train classifiers scope.
I am not able to understood that learning path file What is that file and tell me that what are the data will be there inside the learning path files?

And also tell me that how can i configure the classifiers.

I gothroughed all the documents enclosed in uipath.But i am not able to understand this.

Guide me please.

And also tell me that how can i process a TIF format file which contains more than one page i need to process all the images one by one using MAchine learning extractor.

Regards,
Sriram