The best replacement for lessons is morals.

The best alternatives to lessons are rated as following:
★★★★★  morals
★★★  self taught
★★★  crash course
★★★  classes
★★★  lessons
★★  guitar lessons
★★  activities
★★  self teaching guitar
★  blessings
★  primary language lessons
★  swim team
★  vocal coaching
★  group lessons
★  intensive course
★  rod and staff
★  themes
★  club fitting
★  group swim lessons
  bass lessons
  first language lessons
  group tennis lessons
  teach yourself guitar
  piano lessons
  suzuki
  self teaching
  clinics
  organ lessons
  choir
  keyboard lessons

Your alternative for lessons is not listed? Suggest!
Speaking about lessons, one probably shouldn't forget about piano.

Other search terms related to lessons and their ratings are:
★★★★★ piano
★★ theory test
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Google Trends

Scale is based on the average worldwide traffic of lessons in all years. Click on graph for more.
lessons
morals
self taught