View menu > Clear Guides (the correct way to clear out guides you no longer need. Hiding them won't work)
View > Show > uncheck Grid (it should vanish right there)
Ctrl/Cmd r toggles rulers on and off.
Don't be afraid to consult the Help menu in Photoshop. The answers to your very easy questions are all in there.
I have gone and done view clear guides but I have to do it on every image...really
A recent tip I learned is to toggle off the grid (Cmd/Ctrl '),then reset your workspace. Window > Workspace > Reset Essentials (for example).
If they keep returning, then I would think corrupt preferences.
You can reset those by holding down Ctrl-Alt-Shift and double-clicking on the PS icon. You should get a dialog asking if you want to reset your prefs. Confirm and hopefully this goes away. But that's drastic, you have set up your old settings.
Cmd/Ctrl ' (apostrophe) toggles the grid so you don't have to drill down into the menus.