When I paly Go, I think that Fuseki is good but most of the time I lose. What shall I do to avoide losing? Fuseki and tactical fights need different ability. To play a good fuseki is very important to understand how to balance the board, territory and influence. You can develop your "sense of balance" just playing games. Sure, you can study fuseki if you like (reading books, go lessons and so on) but playing is itself a good exercise. To improve your ability "fighting with the stones" just playing games is not enough. You need to improve your reading skill and the best way is to solve tsume-go problems (life and death problems) and tesuji problems.