<div id="map"></div>

function initMap() {
	/*1. Map 위치 표시*/
	const myLatLng = {
		lat: 위도,
		lng: 경도
	}

	/*2. Map 생성*/
	const element = querySelector(".class_name");
	const map = new google.maps.Map(element, {
		center: myLatLng,
		scrollwhell: false,
		zoom: 18	
	});
  
  /*3. Map Marker 생성*/
	const marker = new google.maps.Marker({
		positon: myLatLng,
		map: map,
		title: "Marker_Name"
	});
}

<script src="<https://maps.googleapis.com/maps/api/js?key=키입력=initMap>" defer></script>