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What's the purpose of having separate checking and savings accounts?
If your debit card/ATM card is stolen or lost, someone else might be able to withdraw money from the checking account that it is tied to, or buy things with the card and have the money taken out of the checking account to pay the merchant. Subject to daily withdrawal limits imposed by your bank, a considerable amount of money could be lost in this way. At least in the US,  debit or ATM cards, although they are often branded Mastercard or Visa, do not provide the same level of protection as credit cards for which the liability is limited to $50 until the card is reported as lost or stolen and $0 thereafter.  Note also that the money in your savings account is safe, unless you have chosen an automatic overdraft protection feature that automatically transfers money from your savings account into the checking account to cover overdrafts. So that is another reason to keep most of your money in the savings account and only enough for immediately foreseeable needs in the checking account (and to think carefully before accepting automatic overdraft protection offers). These days, with mobile banking available via smartphones and the like, transferring money yourself from savings to checking account as needed might be a preferred way of doing things on the go (until the smartphone is stolen!)