Cool, thanks for providing the option to change the board size. A good way to start is to play short games on a 9x9 board (19x19 is the official size, but games take a very long time to play out at that massive size). Just find a friend (or against yourself), and play out a bunch of games as quickly as you can, without overthinking every move. Doing this, you'll discover strategies much quicker on a small board than you could playing out games on large board.