①History Brush Tool (Y)
The history brush is used to reply to the history records. It needs to be practical with the history control panel. The eraser is used to erase images. The difference is big. The history brush is a bit like regret medicine. You can take the wrong steps and use the brush little by little. Reply back, it is often used for coloring black and white pictures. For example, a picture in RGB mode is gray. You can use the hue saturation command to color it. Then use the history brush to change the color of the unwanted part. Wipe off. And the eraser eraser is really gone.
Finally, the historical record art brush can be said to be of little use, creating an artistic effect.
②Eraser tool (E)
Eraser is an eraser, irreversible, use it with caution
Background eraser, for pictures with a relatively clean background, you can erase the background with one click
Magic eraser, erase similar pixels within the tolerance value,
The tolerance value refers to the selection range set when the color is selected. The larger the tolerance, the larger the selection range, and its value is between 0-255.
③Paint bucket tool (G)
Color, gradient or texture the designated area
④Blur/Sharpen/Smear tool
Blur the specified pixels, clear them or smear them off directly, irreversible
⑤Lighten/Darken/Sponge Tool (O)
Sponge tool is a tool used to absorb color in PS software. Use this tool to turn colored parts into black and white. It is different from the Dodge tool. The Dodge tool will lighten all the colors, including black, at the same time when it is lighted, until it becomes a piece of white at the end. The sponge tool only sucks and removes colors other than black and white , which is equivalent to decolorization.
⑥ Pen tool (P)
To use the pen tool, click with the left mouse button and the first anchor point will appear. When you click the anchor point, drag to generate a handle, which can generate a curve of any curvature. If you want a straight line, click without dragging, adjust the handle on one side, and select the anchor Click and hold the ALT key to adjust the handle on one side, straighten one side and bend the other side, select the anchor point, hold down the ALT key and click the anchor point to delete the handle on one side, close the similar lasso tool, and return to the first anchor point , A circle appears in the lower right corner of the mouse to close it.
Free pen tool, free to draw
Curvature pen tool, click on an anchor point and a curve appears between the three points
Add/Remove Anchor Point Tool
Convert point tool to turn sharp corners into curves or vice versa
⑦Text tool (T)
Click once to enter text, click and drag to display a text box
Vertical/horizontal text mask tool, input text in the shape
Properties, font, text size, etc. can be modified in the property panel
⑧Path selection tool (A)
Path selection, select path
Direct selection, select anchor point, path between anchor points
All can be selected by frame and click
⑨Rectangle/rounded rectangle/ellipse/polygon/straight line/custom shape tool (U)
Draw shape
⑩Hand tool (H)
Drag the canvas, temporarily use shortcut keys, space bar + left mouse button to drag
Rotate the canvas
⑾Zoom tool (Z)
Zoom in and zoom out the canvas, 
switch in the property bar
You can also use shortcut keys, alt+wheel
⑿Edit toolbar
⒀ Foreground color / background color
Upper left corner, restore default
In the upper right corner, the foreground and background colors are swapped
The left is the foreground color, and the right is the background color. Click on the color picker to select the color of the area. The color picked up by the eyedropper tool mentioned in the previous issue is stored here.
Fill, the shortcut key to fill in the foreground, alt+delete
Fill the shortcut key with background color, ctrl+delete
(14) Edit in fast/standard mode (Q)
Click swap, mask tool
Alright, this program is over here. In the next issue, we will talk about a specific case to familiarize yourself with the usage of the tool. See you in the next issue, bye~