I am completley new to SFML, and I need guidance.
And I think the best way to learn is by practicing.
I have wrote a tic-tac-toe using only c++, but now I want to write a tic-tac-toe game with graphics using SFML and I could not find a tutorial to help me.
What exactly are you stuck on? Getting SFML installed? Setting up a simple example? It is hard to give a answer without knowing what you are having problems with.
But here is a few links that might help, all are tutorials from the SFML website that should be a good place to start for some of the above problems.
All these tutorials are right on the SFML page and is probably the best place to start your search for material. There is also the github page which contains some more tutorials but most are on more advanced topics.
Anyways best of luck with your learning SFML it is a great graphics library for beginners just gotta put some effort into learning it. If you got a good grasp of C++ (Advanced topics also) I would highly recommend picking up the SFML book to learn about the library. It will walk you through a complete game from start to finish (Graphics, Sounds, Special Effects, Networking, etc. etc.).
Like I said I want to practice SFML by making simple game/projects at first and later more complex ones and I thought that starting with an tic tac toe game for the first time would be a good for practice.