My company is going through a major tech-driven transformation and part of that is upgrading our ancient SAP to S4/HANA. I am moving into a role that will be a functional analyst for MM and PP. I have the data and company knowledge background, but need to bone up on SAP since my current experience is limited and on an older version.

What are some good sites or resources for me to get a solid overview/intro into S4/HANA and maybe even more specifically into MM and PP? I believe my company will be paying or helping for certifications, so this is more for actual learning alone. I am not averse to paying for training as well.

Note: I do have access to Udemy through them, but it is sometimes hard to tell if what I am engaging with is the correct resource since SAP is such a large entity.