What is the fastest way to start studying listening? I counted 300,000 vowels in a dictionary and decided that weak sounds come first

This is the most common consultation I receive when teaching pronunciation.I can understand it when I read the text, but I can't understand it when I hear it.For a long time, I answered this by saying ...
BBC

The Sounds of English: Short Vowels - 1

To play this video you need to enable JavaScript. This is the first of seven short vowel programmes in our series of videos that explore the sounds of English. This is the seventh of seven short vowel ...
BBC

The Sounds of English: Short Vowels - 5

To play this video you need to enable JavaScript. This is the fifth of seven short vowel programmes in our series of videos that explore the sounds of English. This is the seventh of seven short vowel ...