How do I can Make a RPG Game like Zelda
*see what I did there?*
Develop games in your browser. Powerful, performant & highly capable.
The process is the same as making any other game. For a general start add a player sprite and give it the 8direction behavior and then add other graphics for the level graphics. Anything you don't want the player to walk over give the solid behavior.
For specific aspects of zelda you want to do, this tutorial list may be useful: