If you do not want to go down the rabbit hole, then Mapbox.com is the best to start, and you can slowly learn the difference between layers, tiles, vectorial, a

If you do not want to go down the rabbit hole, then Mapbox.com is the best to start, and you can slowly learn the difference between layers, tiles, vectorial, and their JS API is one of the best in the market. Then once you are comfortable, move to Leaflet, while keeping Mapbox tile service, and then build your own.