Below is an example of loading multiple image files at once and editing them at once. In my case, I would like to show you how to batch-change image files from RGB to CMYK, a printing mode.

1. Go to the File ---> Scripts---> Load Files into Stack.

2. Through the Browse button, you can open your all images, which you want to edit at once. 

In my case, I would like to change the mode like below. 

For mode changing, I clicked the 'don't merge' button. 

After changing the mode, I moved File---> Export---> Layers to Files. 

​Save the file as a JPG file in the designated location.

In my case, I converted all images to PDF.

First, check to install Acrobat in your computer.

And then open your photoshop, and then go to File---> Automate---> PDF Presentation like below. 

I would like to share a cracked and broken effect in Photoshop like the above.
Here is the download file, you can text. 

First, prepare your letter, which you would like to split and make a crack effect. 

For just a case, I duplicated the files like below with shortcut, Command+J.

And then next, pick the Pen tool on the left side of Tool bar. 

Then, draw your pen line as you wish to make an effect freely. 

I finished the effects like below. 

Last, you click on your right side of the mouse buttons, then go to Create Vector Mask. 

After then, you can make sure the result like below. 

Click the layer to see your result. 

 ​Below are some of the brushes with special effects other than the basic brushes stored in Photoshop that you may want to refer to if you want to paint oil paintings or watercolor paintings.

First, here is good site to download your brush effect. You have to click(below image) to go the site. 

And then download it. After then you can see the folder and icon like below.

Next, you have to add the new brush in your photoshop. Please follow me. 

First, click the icon of brush on the left menu bar and then find the brush palette like the right image. And then click the right button on your mouse (on the any brush or folder image). You can find the "Import Brushes" and click! 
After then you have to click your previously downloaded file like above. 

If you are succeed to see the screen like below, and then you can use it! Yay~

Please, enjoy your free brush!

 ​When you create a file in Photoshop, many layers are created as shown below. Instead of converting each of these layers into images one by one, there is a way to convert them into files of the same format all at once.

Go to File--> Export---> Layers to Files like below. 

Choose destination, where your converting file will locate with Browse button. 
And then choose your converting file's type. In my case, I choose it as JPEG. 

After then, you can find the all jpg files like below.

And next, for creating one Pdf files from all jpeg, you can move File--> Automate---> PDF Presentation. 

If you find the screen, you make sure to check Multi-Page Document and click the Browse button to open all jpg on the left empty area. 

You can see the all list of the selected jpg files like below and then click the save. 

Final step, you can click the Save PDF button and then enjoy to see your PDF file with all jpg images. 

In my case, I made a pdf file by using the above process to create a formatted file for uploading to Kindle direct publishing.