I passed the CKA last week and wanted to share my experience taking the exam since I saw how a lot of information about the CKA was cluttered and outdated when I was preparing for the exam. If you have specific questions, feel free to leave them in the comment section below.
cka instruction: https://docs.linuxfoundation.org/tc-docs/certification/tips-cka-and-ckad
update on cka exam (june 2022): https://training.linuxfoundation.org/blog/update-on-certification-exam-proctoring-migration/
cka enroll: https://training.linuxfoundation.org/certification/certified-kubernetes-administrator-cka/
udemy: https://www.udemy.com/course/certified-kubernetes-administrator-with-practice-tests/