Is studying tactics for Go useless?
On the contrary, studying tactics for go is essential. Books or online resources on Joseki, Tesuji,  and Life and Death situations are good places to start, followed by general opening strategy as you gain experience.

Playing games on 13x13 boards as well as the standard 19x19 will assist you in gaining experience in the balance between influence to the centre and territory along  the sides and corners.  

However, programming go is considerably more complex than programming chess, leading to fewer good trainers available.