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5.) No Complete Solutions: Do not give out complete solutions. Guide the OP to the solution, but do not solve it for them.

Look into using dictionaries. You can even use tuples as the key so:

conversions = {
    ("meter", "yard"): (m, b),
}

This is just an idea and not sure exactly what you are looking for. Another option could be converting all metric values to the same unit and then running 1 function to convert to imperial...just brainstorming.

"he was standing on his own two feet" .... become useless and hated.

If you don't use metric, there is no confusion.