Resources for the Google Cloud Architect Certification

I recently passed the certification exam for Google Cloud Certified Professional Cloud Architect. A number of people asked me for the resources I used to get through the exam, so I thought I would share them here. One word of context. The exam is only Pass or Fail, you are given no indication of how close you were to the level required. Consequently, I do not know whether the extra effort I put in over and above attending a training course was actually necessary.