What does 'learn the hard way' mean?

[Infin1ty]

Hello everyone,

I'd like to know what learn does hard way mean in the sentence below means:

If they do this ,they will learn the hard way that spending must be done within
a budget.

To me, it sounds: If they do this, they will be taught a lesson that speeding must be done within a budget.

Please tell me what the author intended to mean and if I understand the sentence correctly? Many thanks.

:)
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Please feel free to correct me if you find any mistakes in my posts.

[Harry_Ph]

"Learn the hard way" means that one has to learn through bitter experience. Thus, your given sentence will look like this:

If they do this, they will learn through bitter experience that spending must be done within
a budget.
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The more we learn, the less we seem to know.

[Infin1ty]

Thank you for help me out again, Harry. :)
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Please feel free to correct me if you find any mistakes in my posts.

[Harry_Ph]

You are welcome, Infin1ty.
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The more we learn, the less we seem to know.