Start with 3 Cool Effects You Did NOT Think are Possible in PowerPoint (11 min, Leila Gharani), then Excel for Data Analytics - Full Course for Beginners (660 min, Luke Barousse). All 1301 lessons here are free, from the teachers' own official uploads. You'll need laptop stand, noise-cancelling headphones, second monitor and a few more basics (about $270 of kit). The book to keep beside you: Excel Formulas and Functions for Dummies by Ken Bluttman.