Take a screenshot on your iPhone is easy. There are a couple methods to perform this depending on the model phone you have.

How to take a screenshot on iPhone 14 and other models with Face ID

  1. Press the side button and the volume up button at the same time.
    Arrows pointing to the side and volume up buttons on a phone with Face ID like iPhone 14
  2. Quickly release both buttons.
  3. After you take a screenshot, a thumbnail temporarily appears in the lower-left corner of your screen. Tap the thumbnail to open it or swipe left to dismiss it.

How to take a screenshot on iPhone models with Touch ID and side button

  1. Press the side button and the Home button at the same time.
    Image shows arrows pointing to the side and Home buttons
  2. Quickly release both buttons.
  3. After you take a screenshot, a thumbnail temporarily appears in the lower-left corner of your screen. Tap the thumbnail to open it or swipe left to dismiss it.

How to take a screenshot on iPhone models with Touch ID and top button

  1. Press the top button and the Home button at the same time.
    Image shows arrows pointing to the top and Home buttons
  2. Quickly release both buttons.
  3. After you take a screenshot, a thumbnail temporarily appears in the lower-left corner of your screen. Tap the thumbnail to open it or swipe left to dismiss it.

Where to find screenshots

Open Photos, then go to Albums > Media Types > Screenshots.

Referenced from here