Can i develop games by using only c#?

Answer 1

yes, unity requires nothing except c#. you just have to be mindful of assets like graphics and sound.

Answer 2

yeah with some basic knowledge of graphics

Answer 3

In my view the best option available is unity it has tons of free assets on its assets store
that you can use in your projects.In case you are not familiar with unity there are helpful
tutorials on their website.I've not been involved in game development but
i've tried to make games with other game engines and i can tell that unity is the best so far.