Are you a business user or a consultant?
The answer for you may vary depending on your role in the project.
In general, if you are a business user, you should get training documentation for your company-specific processes from the implementation or from the support team.
If this is about general processes in S/4HANA from end user perspective - you can also try the task tutorials: link.
Did you try to look for an answer before posting? I ask, because when I typed your question title in Google and I added SAP as a keyword (what are the step by step processes for Procure to Pay in SAP), I found plenty of useful resources even on the first page.
The tag, which you chose, is wrong, you should be using MM Materials Management or MM Purchasing, MM Invoice Verification, MM Inventory Management, etc. SAP Fiori tools is related to the development of Fiori apps. Kindly follow this tutorial to learn how to make a better use of the Q&A part of the site: Ask and Answer Questions on SAP Community.
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