I'll be making a list of frequently used shortcuts on GIMP for reference. The page is public, as this might turn out to be useful for the visitors too. Please note that the page as of now is incomplete. Feel free to add the ones that you find useful via comments... I'll add them up.
- New - Ctrl N
- New Layer - Shift + Ctrl + N
- Create Selection from path - Ctrl + V
- Unselect - Shift + Ctrl + A (Ctrl + D on Photoshop)
- Paint Bucket / pattern filling - Shift + B
- Gradient - L
- Magic wand - Z