most important shortcut key you need to know right now

Keyboard Shortcuts for the Browser 

With so many apps already in the cloud, we spend most of our working days in the browser. So it makes sense to master these shortcuts in order to make in-browser work more efficient.  NOTE: While these shortcuts may work in most all browsers, we can only guarantee they will work 100% within Google Chrome, our browser of choice. 
1. Quickly move from tab to tab:Need a quick way to hop from one browser tab to another without a mouse? Then memorize these shortcuts: Ctrl [CMD on a Mac] +1-8: Switches to any of the first 8 tabs, starting from the left Ctrl+9: Switches to the last tab Ctrl+Page up: Switches to the next tab on the left Ctrl+Page down: Switches to the next tab on the right 
2. Reopen the tab you just closed:Accidentally closed that tab and don't remember how to get it back? You can do it the hard way (searching through your browser history) or this easy way. With keyboard: Ctrl+Shift+T: Reopens your last closed tab With mouse: Right click on any tab, choose "Reopen closed tab" 
3. Open or close a tab/window:If you need a new tab, or have to close a tab you no longer need, forget clicking that X, which is often difficult to find anyway. Instead use your keys. Ctrl+T: Opens a new tabCtrl+N: Launches a new browser windowCtrl+W: Closes the current tab Alt+F4: Closes the current window (works for all applications)
4. Refresh the tab:Need to reload the contents of your tab? Here are two ways of doing it. F5 (Cmd+R for Mac): Reloads the current tabCtrl+F5: Reloads the tab but skips the browser cache, re-downloading the entire website

5. Go fullscreen:Sometimes, you just need to maximize that browser so you can block out your system tray or distracting notifications. And there's a simple toggle switch for that. F11: Toggles fullscreen on/off
6. Zoom in or out:Having difficulty seeing something onscreen? Then zoom in.  With keyboard:Ctrl+ + (plus): Zooms in Ctrl+ -(minus): Zooms outCtrl+0: Returns to default zoom level (100%) With mouse:Ctrl+Mousewheel up: Zooms inCtrl+Mousewheel down: Zooms out
7. Search the web:Need to initiate a search quickly? If you're on Google Chrome, simply get to the location bar. For other browsers, here's a quick way to get to your search box. Ctrl+L or F6 or Alt+D: Goes to Chrome location bar Ctrl+E or Ctrl+K: Gets you to browser's search box
8. Search for text within a page:Need to find text within a page? Stop scanning for it using your eyes and use these shortcuts. Ctrl+F: Finds text on the webpage you're currently onCtrl+G or F3: Finds and highlights the next instance of the keyword you searched for (if there are multiple instances)
9. Navigate to a URL:You're about to grab the mouse and click the URL/location bar, right? Don't! There's a faster way. Ctrl+L or F6 or Alt+D: Goes to location bar immediatelyCtrl+Enter: Automatically adds www. and .com to whatever you typed in the location bar and sends you thereAlt+Enter: Opens the location in the address bar on a new tab
10. Move back/forward in history: Yes, you're tempted to hit the back button on your browser ALL the time. But try this instead. Alt+left arrow: Goes back to the previous page in your browser historyAlt+right arrow: Goes forward Ctrl+H: Opens your browser history
11. Advanced: Kill a tab in your browser: Sometimes you just need to close an annoying popup, disable an extension, or close a problematic tab. In that case, you need Chrome's task manager.  Shift+Esc: Launches Chrome's task manager, which allows you to kill specific tabs, processes, or extensions 

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