Blurry ohotos

Adjust the camera’s focus and exposure

Before you take a photo, the iPhone camera automatically sets the focus and exposure, and face detection balances the exposure across many faces. If you want to manually adjust the focus and exposure, do the following:

1. Tap the screen to show the automatic focus area and exposure setting.
2. Tap where you want to move the focus area.
3. Next to the focus area, drag  up or down to adjust the exposure.
4. To lock your manual focus and exposure settings for upcoming shots, touch and hold the focus area until you see AE/AF Lock; tap the screen to unlock settings.

If your Photos and Videos are stored in iCloud and you share it before downloading the original then it may appear blurry but it is not.

Your photos and videos are stored on your device in their original, high-resolution version. This means that they use a lot of space on your iPhone, iPad, and iPod touch. With iCloud Photos, you can make more space available on your device and have your entire collection, everywhere you go.

Get started with iCloud Photos:

1. Tap Settings > [your name] > iCloud > Photos.
2. Turn on iCloud Photos.
3. Select Optimize iPhone Storage to save space on your device.
4. 

With Optimize Storage, smaller, space-saving photos and videos are kept on your device while all of your original, full-resolution versions are stored in iCloud. And as long as you have enough space in iCloud, you can store as many photos and videos as you want.

• Learn iPhone camera basics - Apple Support
• Understand About the Camera features on your iPhone - Apple Support (IN)
• Take appropriate action to Adjust HDR camera settings on iPhone - Apple Support (IN)
• You may Use camera modes on your iPhone, iPad, and iPod touch
• Learn how to --> Take Portrait mode photos with your iPhone camera
• Try to Change advanced camera settings on iPhone - Apple Support
• For Slow Motion and Trimming --> Trim video length and adjust slow motion on iPhone
• Here you can see an Apple Article with all video recording options --> Record videos with your iPhone camera - Apple Support

I take tips from here too. --> Tutorials | iPhone Photography School