One should start investing at an early age to get financial freedom. Particularly in their 20s, they should take enough risks because they have nothing to lose at that time. And slowly start minimizing the level of risks and investing in stable stocks. Parallelly one should have control over his/her expenses. As I mentioned in another insight, sell an item if you are not using it for more than 6 months. My favorite lines inclined to expenses are- "The things you own, end up owning you".
