I’ve just done a quick Google search and have found many Tic Tac Toe games recreated within Unreal Engine 4. Some of them even come with project files, like the one here! What I would suggest if there are no basic tutorials, or once you have advanced a little bit within the engine, take a look at the creator’s project file and reverse-engineer it to suit your needs, taking a look at the blueprints that the creator used to make a game such as this work. Have fun!