Plugin commands won't work

Hey, I'm currently trying to get into coding, and I've tried developing a simple plugin that returns a message when executing a command. However, the command doesn't show up in the help menu, and I can't use it either.

Here is the code for my Main class:

Code:

package me.lazefox.helloworld;

import org.bukkit.plugin.java.JavaPlugin;

import me.lazefox.helloworld.commands.heya;

public class Main extends JavaPlugin{

    public void onEnable() {
        new heya(this);
    }

}

The Command class:

Code:

package me.lazefox.helloworld.commands;

import org.bukkit.command.Command;
import org.bukkit.command.CommandExecutor;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;

import me.lazefox.helloworld.Main;

public class heya implements CommandExecutor {
   
    private Main plugin;
   
    public heya(Main plugin) {
        this.plugin = plugin;
        plugin.getCommand("hello").setExecutor(this);
    }
   
    @Override
    public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {
        if (!(sender instanceof Player)) {
            sender.sendMessage("You're not a player.");
            return true;       
        }
       
        Player p = (Player) sender;
       
        if (p.hasPermission("hello.use")) {
            p.sendMessage("Hey");
            return true;
        } else {
            p.sendMessage("No permission.");
        }
        return false;
    }
}
    

And the plugin.yml:

Code:

name: HelloWorld
version: 1.0.0
description: Hello World
main: me.lazefox.helloworld.Main


commands:
hello:
  usage: /<command>
  aliases: [hey, hi, heya]

 

@LazeFox
I suspect this is the problem:

Code:

commands:
hello:
usage: /<command>
aliases: [hey, hi, heya]

Indentation! It matters! What you're doing is that you're putting a main key "hello" but the server doesn't understand that, all it knows is that the key "commands" contains nothing.

Code:

commands:
  hello:
    usage: stuff
    aliases: [stuff]

 

Thank you very much! That is what fixed it!