English written self-study course: five practical lessons, 8-page coursebook, 8-page fillable workbook with 42 fields, offline lessons and campaign-link workshop, two-tab XLSX analysis sheet and worked practice files. Learn to define metrics, label links, distinguish missing data from zero and plan a sensible next test. Fictional examples; no guaranteed sales or income. Requires a computer, browser, PDF form reader and XLSX-compatible spreadsheet software. No videos, coaching or tracking installation. Digital ZIP download after purchase. 60-day return policy, including US, UK and Ireland. Support: info@einfachhaltbar.de.