The lower the Flow, the more control you’ll have trying to dial in the look that you want. Working with a low Flow percentage gives you the ability to gradually build up effects the more you paint.

Before you can start to take advantage of it, you’ll want to get familiar with the Flow setting. The Brush Tool is the best way to create and blend subtle effects in your images. But once you become more familiar with tools like Layer Masks, Blend If, Flow, and Blending Modes, the real power of the Brush Tool is revealed. On the surface it looks like it’s only good for roughly painting colors over top of a photo–not very helpful at all. This feature can be turned on or off by going to Edit > Preferences > Cursors.If you’re just getting started in Photoshop, the Brush Tool might not have any obvious applications. There is also a Brush Leash feature that displays a thin magenta line between the lagging stroke and the cursor.

When smoothing is increased, the stroke becomes tethered to the cursor, showing where you're dragging while the stroke catches up with the cursor.

Here's a stroke that's been painted with Smoothing set to 100%.

Smoothing needs to set before the stroke is created.

If you look at the Options Bar, you'll see there's now a Smoothing control.

The example here shows a brush stroke created using a mouse with no smoothing.

Photoshop CC 2018 has added a new smoothing feature for use with the Brush, Pencil, Mixer Brush and Eraser tools that allows more control over the jagged effect when painting or drawing.

How to Work with Stroke Smoothing in Adobe Photoshop See Adobe Photoshop: Tips and Tricks for similar articles.

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