Start by tracking your expenses for one to two months, even roughly, to understand your real spending pattern — most people are surprised by at least one category once they actually look. From there, the next priority, before any investing, is building a basic emergency fund of 3-6 months of expenses in a liquid, accessible account, since this is what prevents a job loss or medical emergency from derailing everything else.
Once that buffer exists, check whether you have adequate term life insurance (if others depend on your income) and health insurance, since a single uninsured medical event can undo years of careful saving. Only after these foundations are in place does it make sense to start goal-based investing — using something like the Goal Planner on this site to translate specific goals (a home, retirement, a child's education) into concrete monthly numbers.
The order matters more than the specific numbers: protection and liquidity first, growth investing second. Skipping ahead to investing before these foundations are solid is one of the most common and costly financial planning mistakes.