Google Maps API :

• Goto: https://developers.google.com/maps/web/ and click "GET STARTED"
• Goto: https://cloud.google.com/maps-platform/ and click "GET STARTED"
• Goto: https://console.developers.google.com/apis and create a project.

Main Agenda: -- (JsMaps.html)

• Maps with Marker
• Geolocation
• Events handling
• Clustering
• GeoCode

Additional Agenda:

• Static Maps API --(StaticMap.html)
• Distance Calculation --(Distance.html) (DistanceFromTo.html)
• Directions --(RouteDirectionsFromTo.html)

CAUTION:

Few Google APIs are chargable, keep your API key safe and whitelist only selected IPs before go live.

References:

Docs:

• https://developers.google.com/maps/documentation/javascript/3.exp/reference

Samples:

• https://developers.google.com/maps/documentation/javascript/examples/
• https://developers.google.com/maps/documentation/static-maps/

Github:

• https://github.com/gunrajsm/gmaps
• https://github.com/googlemaps/

Incase of queries post on StackOverflow with tag "google-maps-api-3" to ensure quick reply from developer groups