How do I Add to a number that's on screen?

I've seen a few tutorials on this, but I'm still a bit lost, all I want to do is update a number that is on the screen every time I do a certain event. Would I use text box? or just text? There are so many different ways it seems too complicated. Still confused with arrays and global values, so if there's any super beginner way to do this that'd be awesome haha.

most simple way, using a text object.. and then set text on your event.

next in difficulty: sprite font... and set text

next: webfonts and set text

next: (maybe the most difficult) custom counters