Save Minecraft Schematics?

How can i save schmetics in minecraft? So, so that when I reload Minecraft that it is always where I first put it?

What do you mean by schmetics? Settings? Cosmetics?

These are blueprints

In which version do you want to do that

I play on java. So I already have one in my world, but it doesn't stay when I restart it

I don't mean that, I mean the version

And do you play in the single player?

Yes

And which version 1.16 or something

Yes

Ok then use a structure_block (/ give @p minecraft: structure_block)

And what do I have to do then? Well, I haven't finished building it yet

I now have a block like this, but what do I have to do with it?

Look at this that should help

You paste a schematic into your world and it stays there until you remove it.

Worldedit is required for this.

If you play with mods, then look in the config of the mod for a corresponding setting to save.