Can I learn phaser directly without knowledge about canvas ?

[alidano]

thank you.

[NoxBrutalis]

Simply put yes, you can. There are a few odd things that require knowledge of web coding in general, such as if you want text input in your game, the easier way is to use the DOM(document object model) - what the browser uses to create a text input field etc. But no you don't need knowledge of canvas, or webgl for that matter. Both things could be helpful, but afaik Phaser encapsulates all the functionality you will likely need.