where can i trade stocks online without being an american citizen ?

i mean global stock trading for someone who doesn’t reside in the usa nor is a citizen ..

The answer is yes, but it is not as simple as it should be. You need first to get a ITIN number. File form W-7 to obtain that. Then you need to get an on line brokerage firm to accept your application. Some will only accept applications from non-U S citizens that are applied for in person. You will need to check around. Then you must fund the account before you begin trading.