The key to successful trading lies in choosing the right platform that suits your experience, goals, and trading preferences. If retirement accounts are your main priority, you might consider Fidelity for their ease and breadth of the retirement space. Many discount brokers typically have low to no minimum deposits to open an account. Discount brokers are online stock brokers that cost less than traditional, full-service brokers. Best for no mutual fund commissions: J.P. Morgan Most brokers offer no-commission trading of stocks and ETFs (and sometimes options), so you won’t rack up fees when buying or selling. And if you don’t…