The one thing I learned in high school that has worked for me since ... is,
"No matter what, always be yourself!"
Other things that I took from high school are:
-- never give-in to peer-pressure,
-- be nice to others regardless of the situation,
-- be prepared to protect yourself at all times (but carry NO weapons),
-- my first impression of something or someone, is usually the correct one,
-- and, I love to smile and laugh, so I seek out like minded people.