Start with Making Starbucks Drinks At Home (11 min, Joshua Weissman), then Decaf Explained (21 min, James Hoffmann). All 623 lessons here are free, from the teachers' own official uploads. You'll need espresso machine, burr coffee grinder, milk frothing pitcher and a few more basics (about $610 of kit). The book to keep beside you: The World Atlas of Coffee by James Hoffmann.