You can start your journey with this website from Lullabot education React ❤ Drupal. Then when you are ready to get your hands dirty, give Contenta or Reservoir a try. Have a look at Dries' post about How to decouple Drupal in 2018.
If you are still hungry, here are some clues.
Updated on 22 August 2018
- How to accelerate the onboarding process and how to get a fresh Drupal 8 install, for testing.
- The documentation reduced to the essential for the following topics: tools, projects, Drupal concepts and drupalisms, main events, contribution and service providers.
- A brief comparison of other solutions, and when to use Drupal.
There are at least 42 reasons to onboard drupalship.org!