Hi
I have just completed the Build a Restaurant Locator Trail which is a great resource but which suffers from a few problems judging by my experience.
https://trailhead.salesforce.com/projects/workshop-lightning-restaurant-locator

1. The Challenges all fail unless you move ahead to the next step and complete that before going back and verifying the previous step. Once you get the end and go back and verify the second last step then you get your badge!
2. In the second step the instructions for how to set the Remote Site Settings are incomplete.
3. In the second to last step, the activation steps on the Account Record Home Page dont appear to be needed as the page is already activated as the org default.

Hope this helps in improving the module for the future - its a great resource which I enjoyed following.

How to solve This Error...