i accidentally deleted something in disk utilities (i think the start up disk?) and now when my MacBook boots up i get a question mark with a grey folder how can i fix it? I don't have any kind of backup or time machine i don't really mind or care if all my stuff gets deleted i just want it to work again
As explained in: About the screens you see when your Mac starts up - Apple Support
"You might see one of these screens appear during startup if you've changed your startup options, or if there's an issue starting up your Mac.
Folder with a question mark
If you see a folder with a question mark appear instead of the Apple logo, it means your Mac couldn't find a local or network-based startup disk. This can happen if the disk selected in the Startup Disk pane of System Preferences isn't available. Wait a few seconds to see if your Mac is able to locate the startup disk you specified.
If a question mark appears after you install a software update, select your startup disk again using macOS Recovery."