The book arises as a professional contribution to the work of educators, providing ideas on issues of fundamental validity in the present. The teaching-learning process of the 21st century demands teachers capable of being facilitators and guides, capable of implementing skills that demand more conscious human beings, who can discern the information provided today, and who can find solutions and diverse thoughts to the different problems facing society today and in the future. The teacher's work involves guiding and facilitating information so that students are the inquirers, explorers and researchers in and out of the classroom with the ultimate goal of helping to foster critical thinking, collaboration and communication, leading to a more tolerant, critical, diverse and respectful 21st century society.