while surfing the net, i get some pop-ups directing me to the article of persons who claim to have made really big and quick by just predicting the rise and fall of some binary digits (They call it trading). This is the link to the website for predictions - https://olymptrade.com/platform. If you are into it, my question for you is "does it really pay?" also tell me what you think of it.

Kindly explain the following terms
* CROWDSALE
* pre-sale
* ICO
 and any other term you think i should know about.

I really need help on the best sites to purchase bitcoins & altcoins and sites for transactions as well. I actually need your suggestions as colleagues. I've been trying to learn about the crypto world on my own, though i know i shouldn't but i've got no choice for now.