Maybe tuning a guitar in the past was a bit difficult for beginners, but this days with the new technology and smart phones, it’s really easy. You just need to install an app and the app shows you if it’s tuned or not.
The application name is GuitarTuna and is available for both iOS and Android devices. GuitarTuna has free and paid versions. The free version allows you to tune your guitar, but the paid feature would be much more advanced with a lot of other features.
It’s a pretty straight forward app, you just need to download and install, then open it and it shows you a picture of a guitar. You then choose the string that you want to tune, and it’ll tell you to turn the tuning pegs to make the note higher or lower until its perfect.