how to design like schema in mongoDB

am just learning how to build websites using react / nextjs, and I am structuring my data but unsure on the best practice, I am very new to the mongodb concept.

I stored comments I want to store likes for each post (how the schema would be ? and what will be added to post schema?)

it's the same as instagram likes on posts when userId exists i want it to decrease by one if not increase by one

posts schema:

import mongoose from 'mongoose';
const postSchema = new mongoose.Schema({
    title: {
        type: String,   
        trim: true,
        required: true
    },
    contentEditor: {
        type: String,
        // trim: true,
    },
    author: String,
    img: {
        type: String
    },
    channelImg: {
        type: String,
    },
    videoId:{
        type: String,
    },
    filter:{
        type: String,
    },
    // a blog post can have multiple comments, so it should be in a array.
    // all comments info should be kept in this array of this blog post.
    comments: [{
        type: mongoose.Schema.Types.ObjectId,
        ref: 'Comment'
    }]
    },{
        timestamps: true, //updated at created at things
    }
)

const Post = mongoose.models.Post || mongoose.model('Post', postSchema); 
export default Post;

comments schema:

import mongoose from 'mongoose';
const { Schema } = mongoose;

const commentSchema = Schema(
  {
    content: { type: String, required: true },
    post: { type: Schema.Types.ObjectId, ref: 'Post' },
    author: { type: Schema.Types.ObjectId, ref: 'User' },
  },
  { timestamps: true, collection: "comments", }
);

const Comments = mongoose.models.Comments || mongoose.model('Comments', commentSchema);
export default Comments;