How to Enhance your trackpad’s behaviors
Pick a gesture
First define a gesture to take a screenshot — which you can’t do in System Preferences’ Trackpad pane. Click Add New Gesture. In the pop-up, pick TipTap Right from the Three Finger Gestures category.
Choose an action
From the Predefined Action pop-up, under Screenshots, pick Capture Screenshot (Configurable). Click Capture Whole Screen(s), and if you wish, tidy the file name and adjust its save destination.
Click Save to confirm. Now you can try out your gesture. Rest two fingers on the trackpad and then tap with a third to their right. A screenshot should be saved to the location you specified during step 2.
Move a window
We’ll now create a gesture to snap a window to half the screen. Use 5 Finger Swipe Right (find it in Five And More Finger Gestures); set the action to Maximize Window Right from the Windows Resize & Move group.
Duplicate a rule
Select step 4’s gesture. Copy (Cmd+C) and paste it (Cmd+V). You can now select/edit the duplicate. Below the Touchpad Gesture pop-up, check Cmd. In the Predefined Action pop-up, pick Resize window to Right Third.
Test your gestures
Open a Finder window. Perform a five-finger rightwards swipe and the window will resize to fill the right half of the screen — or the right third if Cmd is held. Think about ways to expand on these shortcuts to suit how you work.
Use a gesture to bring up macOS’ app switcher solely using your trackpad. Set up a gesture that uses 3 Finger Double Tap to invoke the Application Switcher action (from the OS X Functionality category).
Use corner clicks
You can use Hot Corners to activate your screensaver, but it’s quicker to click your trackpad. To set this up, in a new gesture, select Corner Click Bottom Left from the Single Finger Gestures category.
In the OS X Functionality group, pick Start Screen Saver. To avoid triggering in error, check one of the modifier key boxes, such as Cmd. If you have a Force Touch trackpad, you could consider a Force Click gesture.