Software - Krita First Look. 

*Note:
- Don't know anything about drawing.
*Missed:
- Select multiple shapes: Shift.
- Snap to horizontal/vertical/Nx15 degrees: Ctrl or Shift or Alt.
- Change the value of sliders: Right click then type the value.
- Smooth brush: Enhanced brush tools.
- Need a drawing tablet and two monitors to use.
- Manual: docs.krita.org/en/user_manual...
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Software: Krita.
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PS: I'm just a newbie learning editing. Uploading to remember what I did. Something may be wrong.