The MOST important aspect of learning Korean can be Inflection( Conjugation ).
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Because in Korean, it is all about "WHAT VERSION of a word are you using", since the same word will look different depending on what version of it is being used.
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[ For example ]
Walk = 걸어요
Walk = 걷는다
Will walk = 걸을 거예요
Walk but = 걷는데
Don't walk = 걷지 마요
Because walk = 걸어서
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So study Inflection( Conjugation ) starting with Inflection( Conjugation ) 'Route 2'.