the most useful tool options
a. paint with brushes tool The most interesting feature in Brush Options is the distance parameter, and it’s useful to adjust it. If you paint with a small zoom (far away) and a large brush, it’s good to set the distance setting to high. Brush strokes will be more fluid and you’ll see that it’s harder to paint with smaller brushes and movements. For the same reason, keep this parameter low when working with a big zoom (close up).
b. Draw a straight line tool Even though it seems this tool is a combination of a brush and a vector tool, it can still work with brush pressure. Tilt and rotate depending on your choice. c. Draw a rectangle/ circle/polygon tool Those three tools use the same settings. You may choose what kind of filling you want (Not Filled/Foreground/Background Color/Pattern), or if you want an outline to be visible (No Outline/Brush). D. contiguous area selection tool To select a colour within a contiguous area, click a colour to select it and, depending on a fuzziness setting, similar adjacent colours. You can also Grow/Shrink the Selection and change the Feather parameter (blurriness of the selection edges). You can add, subtract and intersect consecutive selections. e. transform a layer or a selection tool You can transform a layer or a selection freehand, but the Tool Options enable more precise transformations. You can control Vertical and Horizontal Translation, Shear and Scale. You can also tilt and rotate the selection/layer around the X/Y/Z axis.