How do we know what we know

I believe that we are born into this world with an empty mind, ignorant to everything around us. As we grow up, we fill up our minds with ideas, thoughts, and actions of the people around us. We learn to accept these behaviors and we develop the sense that this is how the world is suppose to run. Simply living is one of the reasons for how we know the things we know.
Growing up, most of us have parents and teachers guiding us. Parents are mainly there to help us with life in general and teachers are there to guide us through our education. Both teachers and parents play a major role in how we know what we know. Parents give us advice on how we should deal with certain problems. When they do this, they are telling you of the experiences they have had; their advice isn't always accurate though, but since they are our parents, we usually believe them. Teachers learn from textbooks and teaches us in their own words. We, as students, usually agree with what they have to say because it sounds right and others agree with what they have to say. Most of what we know now is handed to us by others.
Everything around us contributes to how we know things. Our mind develops over the years and we experience more things around us. We have people to tell us information that they know and there are people guiding us throughout our life. We know what we know just by living.