This 6-class track is very good for GCP and general cloud architecture knowledge: https://www.coursera.org/professional-certificates/gcp-cloud-architect. If you don’t want to do all of it, Courses 1, 4, 5, and 6 cover everything you need. Courses 2 and 3 are a deeper dive into core components, and 7 is preparing for the cert exam.
FYI the GCP Cloud Architect exam is getting updated starting May 1st. The Coursera track I mentioned is good for the current, soon to be old exam version (but the general cloud architecture knowledge is still good). Coursera will likely update their content to match the new exam, but don’t know when.