The usual advice is to keep several months of expenses set aside for emergencies. That is a sensible long-term target, but it can feel so large that it is hard to begin. Thinking in layers turns one intimidating number into a series of smaller goals you can actually finish.
Start with a starter cushion
Your first layer only needs to cover a common, small disruption: a repair, a medical copay, or an unexpected trip. Pick a round amount that feels achievable in a few months and treat reaching it as a real milestone. Even a modest cushion can keep a minor problem from landing on a credit card.
Grow toward one month of essentials
Next, add up what one month of essentials really costs: housing, utilities, groceries, insurance, transport, and minimum debt payments. Leave out the extras you could pause in a hard month. That figure becomes your second layer, and each full month you save after it adds another layer of breathing room if your income is interrupted.
Keep it separate and easy to reach
An emergency fund works best when it is out of sight in daily life but available quickly when needed. A separate savings account, ideally one that pays some interest, keeps the money from blending into your spending balance. If you do use it, that is the fund doing its job. Rebuild one layer at a time, starting again with the starter cushion.