After 24 years in hard‑rock exploration from Nevada to Chile, I’m pivoting toward subsurface work in CCUS and geothermal and want resources that translate field mapping and 3D modeling into reservoir workflows. I work in Leapfrog and QGIS, started Python in January, and I’m weighing Petrel/CMG or TOUGH3 — what courses, certificates, or datasets have truly moved the needle for you? Also, how did you frame the transition on project writeups or resumes when managers came out of petroleum?