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Yes, it is true that most of the modules in Trailhead have been changed to Lightning. It is suggestible to work on Lightning experience while working on Trailhead as the content and challenges are referred in Lightning.
You can make use of Trailhead playground while working on the Trailhead challenges.
https://force.desk.com/customer/en/portal/articles/2643793-trailhead-profile-signup-login-faq?b_id=13478
Hope this helps you!
Thanks,
Deepthi