Ploddings

https://en.wikipedia.org/wiki/Guitar_tunings

Learning to tune your guitar when you first start can be both difficult and frustrating. However, it is important you persevere and learn this skill, as it is very important. You will have great difficulties in hearing how songs should sound if your guitar is always out of tune.

Tuning requires using your ears to bring the guitar to the correct pitch. Tuning can be difficult if you have a poor sense of pitch, or if you are in some way tone deaf.

You could consider purchasing an electric tuner to help you, however buyer beware! Purchasing a cheap electric tuner could prove to be more of a headache than a good investment. Spend the money on a good tuner that will give an accurate reading.