The 50-30-20 Rule

The 50-30-20 Rule is a basic framework that says that 50% of net income should go towards needs (such as housing and food), 30% should go towards wants (such as that video game you really want), and the remaining 20% should be allocated towards savings and debt repayment.

Source: Buzzfeed

Obviously, this rule is a general outline, and varies based on individual circumstances, such as income level, expenses, and financial goals, and thus should be adapted to your preferences.

To adapt your budget, you should regularly monitor spending, compare actual expenses to your budget, and adjust as needed for changing circumstances.