What are these overlays and how do i get rid of them?

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@Numbers on Numbers wrote:

And is there a way to get rid of this grid thing without restarting?

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In addition to what Trevor and Conrad have said, there is one tool for drawing slices and a second for selecting. You have drawn one user slice (gold outline) and it created several generated slices. Use the Slice Selection tool to select the Slice you accidentally drew and delete it. You will now have one slice. Hide it in View > Show, then hide both Slice tools as per Trevor's instructions.

Jane

It's not a bad idea to remove the tools you never use from the Toolbar.  For me that would be single row Marquee tools, Slice tool, magnetic lasso tool and others.  Save your custom toolbar to a custom workspace, and if you should ever need a deleted tool, switch back to Essentials.  I also remove shortcuts from unwanted tools, so when I hit B I know I'll get the Brush tool.  I also turn off the Shift key for toggling through tools with the same shortcut, because why would I use two fingers when one will do?

Slices (created with the Slice tool) became enabled, probably by an unintended key press, so turn off slice display under View > Extras I think.