I am currently invested in a few ETFs just because its usually more safe compared to buying a lot of just one stock, and I currently work at a financial advice firm as an intern (but I have never studied finance or economics.) However, I sometimes see people earn loads of money in short amount of times by trading by the second. How do they do this?
Also if you have any articles or things I can read to help me understand investments better please provide them if you can.