I ran into a conversation on Discord recently where someone was unaware of the "Displayed Text" properties for RichTextLabel and Label, so I wanted to make a note about that.

visible_characters and visible_ratio allow you to define how much of the text you would like to show, allowing you to do animations that make the text appear like it is being typed out. visible_characters allows you to do this by defining how many characters to show while visible_ratio allows you to do this by defining a percentage (between the value of 0.0 and 1.0)

visible_characters_behavior lets you define how those characters appear onto the screen. VC_CHARS_BEFORE_SHAPING looks exactly like text being typed by a user onto the screen, while VC_CHARS_AFTER_SHAPING shows the text where it would be after all the text is typed, preventing the visual flicker when text is added to the end of a line before jumping to the next line due to reaching the maximum length of the line.

I'm not sure what the other values for visible_characters_behaviour does exactly, though I imagine you'll have to use them if you are integrating support for RTL languages.