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How this site works

  • Each answer starts with a short, direct reply. More detail is below if you want it.
  • Lessons can be read in order or on their own. Progress is saved only on this device, if you choose.
  • Words with a dotted underline link to the glossary.
  • Every page lists its sources and shows whether experts have reviewed it.

What this site cannot do

We explain general rules. We cannot tell you what your plan will pay, decide your eligibility, or give tax or legal advice. Your plan documents, notices, and qualified professionals have the final word for your situation.