If your MacBook has become slow over time, it can quickly become tempting to buy a new model. By resetting your current MacBook, and thus reinstalling the operating system, your MacBook can easily regain its speed and become (almost) as fast as new. Follow this guide – it's quite manageable and doesn't take that long.
NOTE: Before resetting your MacBook, we recommend that you make a backup. It is also important that your MacBook is connected to the internet, as this is how your Mac downloads the latest Mac OS operating system.
The reset takes place in connection with the start-up process. You must therefore restart your MacBook. As soon as your Mac starts up, press COMMAND ⌘ + R until the Apple logo appears on the screen. Then follow the instructions that your MacBook gives you.
You will first be guided through a process where you delete your data (as long as you have made a backup, you don’t need to worry about this). During this process, select your Mac's disk, often called 'Macintosh HD' and click on 'Delete/Erase'. You can then reinstall MAC OS X by clicking on 'Reinstall macOS'. Your MacBook is now reset.