Latiff

Is it legal to copy and past theorical concepts from the w3School Website? For example, so I can specify myself: Opening a Libre Office Writer file, and to make a grid, and to start putting tags and theyr definitions that describe theyr functions. My main goal is to do that in case the net goes off or something so I can learn, even, offline. But yes I guess there might be some copy rights after all. Hoping i get an answer to this.