Quick keyboard shortcuts for Windows and Mac: delete a word with Ctrl or Option+Backspace, take screenshots with Command+Shift+4 or Windows+Shift+S, reopen closed tabs with Cmd+Shift+T, and lock your screen with Ctrl+Command+Q or Windows+L.
Here are some useful keyboard shortcuts you might not know about Control Backspace on Windows or Option Backspace on Mac deletes the entire word Control plus and arrow key on Windows or Option and an arrow key on Mac moves the cursor forwards or backwards by entire words. On a Mac, Command Shift 4 will give you these crosshairs that you can click and drag to take a screenshot, or on Windows, The Windows logo key +shifts opens up snipping tool, which is what you use on Windows to take screenshots in Google Chrome. If you've accidentally closed out of a tab that you still needed. Command Shift T on Mac or Control Shift T on Windows will reopen the most recently closed tab, and on a Mac, Control, Command and Q locks your screen. Or on Windows, the Windows Logo key and L does the same thing.