Can games be one of the most effective teaching resources? how?

Absolutly yes, because of so many reasons well, games contain some setting aspects and dialogues between the heros of the game (im talking about video games ) this can allowed the kid to continue the mission if he will push him/herself to search on the meaning of the keyword he/she faced through the game he will find the meaning so in this case he just achieved and rised a new word to his mind's memory and for sure he/she will use it through his dialy life and the same case with some games such as alphabets puzzles etc...hope that i ve gived you a useful answer don't hesitate to ask more questions dear sister.thanks

Sure especially for the kids, and the people who are not interested in texts.