Understanding OpenLayers code?

How does OpenLayers work?

OpenLayers is an open-source (provided under the 2-clause BSD License) JavaScript library for displaying map data in web browsers as slippy maps. It provides an API for building rich web-based geographic applications similar to Google Maps and Bing Maps.

How do I learn OpenLayers?

Find source code and learn how to build applications by following step-by-step instructions.

1. Authentication. Create an API key.
2. Maps. Display a map.
3. Layers. Add a feature layer.
4. Query and edit. Query a feature layer (SQL)
5. Style and data visualization. Style a feature layer.
6. Geocode and search.
7. Route and directions.
8. Data enrichment.

How do I use OpenLayers in JavaScript?

How to create a simple map (with a marker) using OpenLayers ?

1. Put a element where you want your map to be.
2. Now you can add a