Well saidIf you want to save you should be serious about it. You have to sacrifice and be determined to do it.
List down all the things you are using and select them what you want to eliminate in order to save money.
You should know the difference from your wants and needs. In so doing, you know what you are going to prioritize on what to spend and what to save.
Well the idea is that you should not depend solely on offline work , one should have several earning opportunities.This is rule is good if you have atleast average salary. If you have less than that, 50% of income can't be enough for basic living so you need to take it from other parts and rule goes off.