In English, we have sentences such as:

Going to university can be rewarding

Seeing you again is great

Keeping your room clean is absolutely necessary

or

Happiness is a great virtue

and so on.

My point is how you would say the same in Turkish, i.e., seeing, keeping, going, coming, in the context I have described above. In other words how is it possible to convert a verb into a noun (? I am not good at grammer).

Thanks

You can use infinitive for that: http://www.turkishclass.com/turkish_lesson_265

For exapmle:

Üniversiteye gitmek taltif olabilir

Seni tekrar görüşmek harika

Verbal nouns have specific use in Turkish: http://www.turkishclass.com/turkish_lesson_322

Odanın temiz tutulması kesinlikle gerekli (The keeping-clean-of-your-room is absolutely necessary)

Hope I translated correctly