Minecraft commands minigames?

I want to build a Find the button map, and I wanted to ask what this command is called, with which you can make a colored font appear in the middle of the picture (Minecraft PE)

/ title [PlayerName] title What you want to display. (Level 3)

/ title [PlayerName] subtitle What you want to show below. (Pizza)

After title or subtitle another color code if you want to make it colorful… Eg. §4 for red

EDIT: You must first execute the title command before a subtitle can stand. The subtitle can never be without a title!

Where can I see which code stands for which color?

Can you also use @s or @a instead of (player name)?

https://minecraft-de.gamepedia.com/...rungscodes
Yes, @s, @p, @a, @e, everything.

https://minecraft.tools/de/title.php is a good cmd generator for this.