Windows 10 does not have the old 'Guest' account like previous versions of Windows, what you can do is create a second user account on your PC which is not an Admin account and will have limited access . . .
Open the Settings App
Go to Accounts - Family and other People
Click 'Add someone else to this PC'
Follow the prompts to create a new account
Do not provide an Email address, click 'I do not have this persons sign-in information'