import discord
from discord.ext import commands, tasks
from discord.commands import slash_command, Option #, SlashCommandGroup if you want to create a category.
class CogName(commands.Cog): # Replace 'CogName' with your cog name.
    def __init__(self, bot):
        self.bot = bot
    category = SlashCommandGroup('Category name', 'Category description')
    @slash_command( #change it into @category.command( if you use category.
        name='command name here',
        description='commnad description here',
    )
    async def commandname(self, ctx, option: Option(str, 'This is option', required=True)):
        embed = discord.Embed(
            title='hello',
            description=f'{option}',
            color=discord.Color.green()
        )
        await ctx.respond(embed=embed)

def setup(bot):
    bot.add_cog(CogName(bot))

import discord
from discord.ext import commands, tasks

class CogName(commands.Cog): # Replace 'CogName' with your cog name.
    def __init__(self, bot):
        self.bot = bot
    @command.Cog.listener()
    async def eventname(self, ...):
        # do something
    
def setup(bot):
    bot.add_cog(CogName(bot))