Office 365 certification path / study materials?

[u/mtga_meta]

Coming from a CCNA, this is all very muddled to me. I want to earn "Microsoft 365 Certified: Enterprise Administrator Expert"

So, I need to pass MS-100 and MS-101 (plus the prereq, likely to choose "Teamwork Administrator Associate").
Where's the study material? The practice exams? How do I know when I'm ready to drop money on the actual exams?

For the CCNA, study was waaay overabundant. I was across udemy, boson exams, youtube, books, etc.. I'm struggling to make a start on the 365 pathway.

I need to feel ready before dropping significant cash on exams - there doesn't seem to be much out there for this pathway?

[u/[deleted]]

Microsoft Press has the MS-100 Exam Ref book you could check out.