1. First, Rachel teaches us not to settle. If you do not like where you are in life, you can fight hard enough and push past it.
For example, she leaves her fiancé, Barry, at the alter because she does not really love him, she also starts off her career as a waitress but wants to live up to her potential so instead she scores a job in fashion with Bloomingdales. Similarly, when her critical father father is judgmental towards Ross, she pushes Ross to keep fighting to make good relations with her father. If you want to live like Rachel, you must not settle for anything less than ideal, people may tell you that you are a shoe, but you, you are not a shoe, you can be a purse if you want to.
2. Next, Rachel teaches us the importance of knowing how to cook.
Poor Miss Green is not the best cook, in fact, usually anytime she tries to cook, she somehow confuses food products that should never be placed together and her friends have to pretend like it is tastes good. Luckily for Rachel, her roommate is a chef and will not let her starve.
3. Rachel teaches us to be brave.
Rachel left everything behind and moved to New York from her sheltered and wealthy family with no connections or bank account to her name. Miraculously, she runs into her high school best friend she ditched while in college and ended up rekindling their friendship. Along with her friendship with Monica, she gains four other new friends who then convince her the only way to move on and be independent is to chop up her old credit cards linked to her family's money. If that's not true trust in a group of people you just met, then I don't know what is.
4. Finally, Rachel teaches us about true love.
She declares that "Ross and Rachel" are never off the table, so when you find the one you love, you will know and that my friend, is true love. Find your lobster and never let them go, even if you have to work through some rough patches.