Instrument variety matters less than beginners typically assume and more than they realize in one specific way. For your starting focus, whether that's forex majors, equity indices, or specific stock markets, verify that your chosen broker handles those particular instruments well in terms of spreads, liquidity, and execution quality. Breadth of offering becomes relevant primarily if your strategy requires correlation across asset classes or if you expect your interests to evolve significantly. The risk of too much choice is decision paralysis and the temptation to chase whatever market is moving rather than developing genuine expertise in your chosen area.