I begin to develop game but I don't know best ebooks for build simple game framework in HTML5 . Can anyone suggest ebooks for me and where to get free image resources for build map in game like as Contra, Super Mario, ... such as grass, characters, animals, monsters,...?
I tried this one and it really helped me up understand a lot of things and gae me the basics to start my own games:
For your second question, there are plenty of free resources out there.
http://opengameart.org has some good stuff, though some of it may have attribution licenses etc.
Here's a list of places for free art someone compiled, it seems to have something for everyone: http://letsmakegames.org/resources/art-assets-for-game-developers/