I finally noticed that the script editor lists all methods and you can click them to jump there... I feel stupid and embarassed.
On the other hand my 💗 for 
grows with my stupidity.
I wish there was a Godot emoji.
EDIT:
I decided to make this a bit more useful thread.
Feel free to post things about Godot that you didn't know existed because you overlooked it all the time 😀