I started playing guitar in the mid '90s, and was lucky enough to have some instructional tapes, despite them having what I remember to be a pretty high price in general. Nowadays many of these can be found online (maybe don’t link anything), but what I’m really curious about is if you have any favorites, lessons which really impacted your playing.
For me, they are Tony MacAlpine’s Shrapnel University tape, which was my first exposure to shred guitar, and Marty Friedman’s Exotic Metal Guitar, which influenced my phrasing. Other important ones were Petrucci’s Rock Discipline, of course, MAB’s Speed Kills, and Reb Beach’s (which kicked off a long tapping phase).
What did you like?