Cut - Touch & pinch thumb & middle finger. Combine with Shift for Append Cut in some apps.
Copy - Tap thumb & middle finger - Shown at right
Paste - Touch & expand thumb & middle finger. Combine with Shift for Paste Special... in some apps.
Undo/Redo - Touch & slide thumb & middle finger up/down. Slide quickly & crisply to undo just one step, or gradually for multiple steps.
Tab/BackTab - Touch & slide thumb & middle finger right/left. Slide quickly & crisply for just one tab, or gradually for repetitive tabs.