I don't understand the meaning of this phrase I want some examples, please

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1

I don’t understand the meaning of this phrase
I want some examples, please

2

No matter how hard I try, I cannot master how to use the definite article.

3

لا أفهم الكثير ممن أسمعه بغض النظر عن الكيفية التي أستمع بها
No matters = بغض النظر