1870 stock market feedback

I didn't think that i was the best entrepreneur but i made more money than what i had in the start which is $80. It was really easy to sell things, but buying things that was in high demand was really hard. Mr.Coyle's phrase "you have to spend money to make money" is absolutely one of those phrases that i have to totally agree with. You MUST buy stock, to sell it. A lot of it has to do with luck too. Educated guesses are extremely useful too, because for the great northern railroad, it started off really low, and each stock was very cheap. So i bought about six Northern Railroad's and did not sell until i got the price i wanted. I bought it for really low, but when the stock prices changed, i sold it for really high. This is when another one of Mr.Coyle's phrase "buy low, and sell high" comes in. When stocks are being sold for really low, you might as well buy it because even at the end when the stock prices are low, you can just sell them, and still make SOME sort of profit. The Comstock silver had very low stock prices, so i just bought more, and at the end, it raised quite an amount.
"Don't put all your eggs in one basket" That metaphor could me a lot of things, but one of them is PROBABLY don't buy the same things. It's okay to buy about 6 of the same thing, but don't don't buy just all the same thing. Don't spend ALL your money on the same stock because if that doesn't make good money, then you will not gain profit.