It is like real life

when you are learning something new, you pick up basics pretty quickly, and then the learning gets slower because you are learning more difficult concepts or processes

take piano lessons for example

you learn the scales in a very short period of time

you learn to play Mary had a Little Lamb and BaaBaa Black Sheep fairly quickly

the songs you want to play get progressively more difficult and it could take years to learn to play Beethoven or Mozart, or Rachmaninoff

if you have a talent for music, the process takes less time, if not, it takes a lot more work
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Why is it that if someone tells you that there are 1 billion stars in the universe you will believe them,
but if they tell you a wall has wet paint you will have to touch it to be sure?