Your first error should read something like the following.
test_assert_truth has damaged your karma.
You have not yet reached enlightenment ...
Failed assertion, no message given.
Please meditate on the following code:
What do you do? Open up about_asserts.rb in a text editor and go to line 10. Fix the test so it will pass. In this case, replace false with true. In most cases, replace a double underline with a value that will make the test pass. Then run the tests again, and move on to the next test. Do this a few hundred times and you'll know Ruby!