This is very, very wrong. The technology is not what drives the stock price of a company. What does drive it? It takes years of studying finance to learn. Your

This is very, very wrong. The technology is not what drives the stock price of a company. What does drive it? It takes years of studying finance to learn. Your statement is akin to a trader telling another trader that, since they specialize in studying Apple, they could probably be great at being iOS app developers. "[...] if you know a company well and you know they are doing great and will be doing great in the next year you should buy their stock" This is an example of a very common fallacy. Even if I tell you that e.g. Apple will be doing great as a company in the next 5 years, that's not a reason to buy their stock. The reason would be if I tell you that their stock is undervalued! This is one of the first rules you learn in finance - if I can guarantee a future payout stream (e.g. $1000 in 1 year, $2000 in 2, $1500 in 3, $4000 in 4...), I can calculate how much that payout stream is worth now. This is what a companies' stock essentially is - a promise of a future payout stream. So if the stock is trading higher than that stream is worth, then the stock is not a good investment.