Mathematics and its opposite (We should use as few axioms as possible but some need as much data as possible;)
Programming (used 20+ languages in the past 30 years, now mainly interested in MQL5, Python, and whatever is deemed appropriate).
OCEB 2™-F : OMG Certified Expert in BPM 2™ - Fundamental
PSM I : Professional Scrum Master I
PSPO I : Professional Scrum Product Owner I
ISTQB : Certified Tester