//top of file
const Discord = require('discord.js')
//example (inside of a command)
const embed = new Discord.Message.Embed()
embed.setAuthor(`example`)
embed.setTitle(`example`)
embed.setDescription(`example`)
message.channel.send({embed});
//there are obviously some other add-ons, such as AuthorIcon and URL.

All of the following limits are measured inclusively.
Leading and trailing whitespace characters are
not included (they are trimmed automatically).
title	256 characters
description	4096 characters
fields	25 maximum fields
field.name	256 characters
field.value	1024 characters
footer.text	2048 characters
author.name	256 characters
Additionally, the combined sum of characters in all
title, description, field.name, field.value, footer.text, and author.name fields
across all embeds attached to a message must not exceed 6000 characters.
Violating any of these constraints will result in a Bad Request response.

const Discord = require("discord.js")
const embed = new Discord.MessageEmbed() // Ver 12.2.0 of Discord.js
.setTitle("This is a title")
.setDescription("This is a description")
.setTimestamp()
.setFooter("This is a footer")
.setAuthor("This is the author's name", //and this its profile pic)
.addField("This is a field", "this is its description")
.setImage("https://images-ext-2.discordapp.net/external/cC-YBJkH2GXnX7MHMASUM9Gle1S1im3rDJj2K54A28w/%3Fcid%3D73b8f7b19a5ccc575679c0a7fc4a673b753e4ce993f35223%26rid%3Dgiphy.mp4/https/media2.giphy.com/media/Q8bEDnj9hZd6vivXSZ/giphy.mp4")
.setThumbnail("https://images-ext-2.discordapp.net/external/cC-YBJkH2GXnX7MHMASUM9Gle1S1im3rDJj2K54A28w/%3Fcid%3D73b8f7b19a5ccc575679c0a7fc4a673b753e4ce993f35223%26rid%3Dgiphy.mp4/https/media2.giphy.com/media/Q8bEDnj9hZd6vivXSZ/giphy.mp4")
<message>.<channel>.send(embed) // Remove the brackets <>

Heres an embed visualizer: https://leovoel.github.io/embed-visualizer/