1. Keep up the good work!
2. That was a nice try. (say this after someone made a good effort but failed)
3. That's a real improvement.
4. You're on the right track.
5. You've almost got it.
6. You're doing great.
7. Don't give up! / Hang in there!
(when someone is currently having difficulties)
8. You can do it!
9. Give it your best shot. (best shot = best try, best effort)
10. Nice job! / You did great!
(after the person has done something good)

Fact
The right side of a boat was called the starboard side due to the fact that the astronavigators used to stand out on the plank (which was on the right side) to get an unobstructed view of the stars. The left side was called the port side because that was the side that you put in on at the port.      .. More >>