Changing lenses is a normal thing because generally you use more than 1 lens to take photos. There are several things you need to pay attention to when changing lenses, especially when outdoors. A lot of dust can enter and stick to your camera sensor, causing blemishes on your photos.
Some tips for changing camera lenses:
1. Put the camera strap around your neck and position the camera facing down
2. Attach the front lens cap to be replaced
3. While pressing the button to open the lens, turn the lens counterclockwise, but do not remove it
4. Prepare the new lens to be installed, remove the rear lens cap
5. With the camera hanging and facing downwards, remove the old lens
6. Quickly attach the new lens, pay attention to the color of the dots that match the color on your lens (white / red), and turn it until it locks
7. Close the back of the old lens
Please remember not to change lenses when there is strong wind because this will cause dust to enter the camera. You can also activate the sensor cleaning feature on the camera to reduce the risk of dust sticking to the sensor.