Learning photography can start with mobile phones: what is retouching?

If you take pictures, you can usually use your own mobile phone. Preferably a SLR camera. If you retouch the picture on your mobile phone, you can use vsco. If you edit the video, you can take a small photo. If you use a computer, you can use photoshop to retouch pictures and ae to cut videos. You can download these mobile phone software from the App Store. You can find a lot of related software by searching idolize or fans.