Drupal 9 is here and it's called "Drupal 8". Here are 7 reasons you'll want to upgrade your Drupal 7 website NOW.
I didn't get to contribute much to Drupal 6 before it happened. I was still learning how to use the toolset the Drupal community uses for these things, and after one successful attempt to contribute to core, I decided to focus my attention on contrib for a while. It's been more than a year since that time (probably closer to two) and I'm much more comfortable and familiar with these tools, as well as having a much better idea of what it is that Drupal is "all about".