[I am Beginner in Photoshop]

Here are some simple tips for beginners:

1. Transform: Change the size of an image, rotate, flip or distort it!
2. Change the Unit of Measurement.
3. Magnetic Lasso Tool.
4. Magic Wand Tool.
5. Custom Shape Tool.
6. Adjustment Layers.
7. Layer Styles.
8. Spot Healing Brush

[best image format]

I couldn't imagine anything better than to see a report on this including a portion of the proposed changes.:)

[What's the best Linux distro for a beginner?]

I'm sharing my experience with you when i was a beginner i start using these two and i hope these are best for the beginners.

1. Ubuntu. If you've researched Linux on the internet, it's highly probable that you have come across Ubuntu
2. Linux Mint Cinnamon. For years, Linux Mint has been the number one Linux distribution on Distrowatch

[Image Preview On The Desktop?]

I guess you have the images in the format which shows your pictures in this mode as @johnpol78 said change the format of pictures and then open it with another program like image viewer or someone else.

[Buzzing sound after update.]

I couldn't imagine anything better than to see a report on this including a portion of the proposed changes.:)