(Ctrl = Command on a Mac)
Try Ctrl + Shift + T to reopen the last tab you closed.
Ctrl + T will open a new tab.
Ctrl + Backspace will delete the previous word in the address bar.
Ctrl + N will open a new window.
Ctrl + Shift + N will open a new incognito window.
Ctrl + V will paste.
Ctrl + Shift + V will paste with no formatting.
Ctrl + F will help you find any word on a page.
Hit the Space Bar on any website to page down.
Shift + Space Bar will page up.
That should get you started. When you are ready for more, here is a great list of 70 other helpful Chrome Shortcuts.