How do I stop having to log in every time my Mac goes to sleep? 2017 iMac 27 inch, OS Ventura

System Settings > Lock Screen > Require password after screen saver begins of display is turned off > Never

What Barney-15E said.

or get an Apple Watch, and enable unlock with Apple Watch, and then you can have a locked screen, that instantly unlocks when you sit down and press a key on your keyboard 😁

Then again, if you are in the same room, and someone else presses a key, your Apple Watch will also unlock the Mac 😱. But you have the option of tapping your Apple Watch screen, and quickly locking your Mac again 😳.