Some says: that if you don't try you'll never know. While this may very well be true, I tend to think that you never will actually know what you don't know until you become fully aware that you don't know. For example:

$know = "something";
  if (is_null($know)){  
  echo "I don't now anything";
} else {
  echo "I know something";
}
if ($know == "something") {
   echo "...I'm sure that I know something";
} else {
  echo "What things I don't know?";
}

As expected the first test will never result in "I don't know anything" the same way the second test will never result "What things I don't know? because you got to $know "something". Coincidence? I don't think so... What I do know is: I do not know a lot since I'm new on this thing.

Trying to learn about PHP, Laravel and so on. Cheers!