I am a beginner too. Below is a problem I am recently working on. You can work on it too if you think you have a lot of PDFs in any part of your shipping business. I started attacking this to mainly learn python and uses python ML libs.

My problem statement includes classifying hundreds of thousands of PDFs to different categories based on the content/first few pages. That is, if you have a pdf of a novel by Jeffrey Archer, it should be categorized as Entertainment or Novel etc. If you have a e-book of say Python for Dummies, it should be categorized as Engineering or Technology or Education or Programming and the like.