1. C
2. C++
3. Java
4. Python
5. Linux
6. Matlab/Octave
7. Assembly
8. Machine Learning & Pattern Recognition
9. Networking

Yes... I'm a CS enthusiast and one day I wanna master all CS skills (programming languages & techniques). Thank you all, in advance for helping this community to reach its goals. I wish you to reach yours, whichever they are. ;)