AAISM, AAIA, AAIR or AIGP: pick the one that matches your job.
AAISM, AAIA, AAIR and AIGP side by side: who each is for, prerequisites, domains, fees and pass marks, and one scenario answered four ways.
AAISM articles.
Plain-English notes on the AAISM exam and the credentials around it. Start with the AAISM exam guide if you're new to it.