About Tiles

Hello guys, i never used tiles or something related to it on the plugin dev, can you tell me please about it? thanks.

sorry for the ignorance

A tile is like a block with extra data, for example a Chest, Furnace, Sign, and others.

No. It is the extra data associated to the block, not the block itself. The difference may sound pointless to you, but when you work on some more advanced stuff about them (like level saving or tile sending), you would find them different.

Oh, ok.

So everything inside a chest is saved in tile data?

Yes, except the chest's orientation.

so flower pot or mob head is tile too?

Not sure, they don't seem to contain extra tile data like chests and signs.
Only these have tiles implemented on PocketMine: https://github.com/PocketMine/PocketMine-MP/tree/master/src/pocketmine/tile