Buying bitcoin in an exchange is the fastest way to obtain bitcoin. But if you want free bitcoins then there is another way to obtain bitcoins depending on your luck. Hacking bitcoin wallets is one of the fastest way to obtain free bitcoin. You just need to find ways on how not to get caught when you do hack someone's wallet. And in the world of cryptocurrency smaller amount of money is harder trace than high value bitcoins.
Let's not promote immoral behaviour. Hacking someone else's wallet is similar to stealing cash from a person in the street.
Money is not what makes people happy and especially if you steal it I guarantee you won't feel any better. Think long term and not short term. As I said the best mindset when it comes to earning money is "How do I create more value for others"?