EDIT: Actually, there's a third one: The person telling you about stock X trying to generate interest in it so that the price goes up (thus improving their own stock investments), a practice called "Pump and Dump". Frankly, no offense to Blazinarps, but I can't help but getting that vibe here.
No offense taken, although I would say that someone just starting to learn about stocks is not going to have enough money to invest to move the price (i'm guessing) 1/10000th of a cent.
EDIT: It just dawned on me that people in this thread likely don't know what Berkshire Hathaway is, and maybe that's where skepticism is coming from. It's the company headed by Warren Buffet.
No more plugging for BH, but it will be interesting in a year to look at the link I posted and compare BH to the rest of the market. I won't rub it in too badly when I'm right.
Typically you would see someone with like 2 posts doing that.
My other advice when you start trading, is to actually look at how much you're paying in a brokerage fee per trade.
If a stock is, to make it easy, $10 per share, and you pay, say, $5 per transaction, you need to figure that into your price.
If you have 100, you will be able to buy 9 shares, for $95, or 9.50 a share.
The stock will need to move up .50, or 5 percent, before you even break even.
That's a lot to overcome, so it would be best to wait until you can buy more shares before starting.
The more shares you can buy/sell per trade, the less the broker fee will play into your earn rate.
That should be obvious, but it's easily overlooked.