welcome aboard in here and i hope you are enjoy while you stay here and you can found many good information and read more about bitcoin. for your question, you can watch the price of bitcoin and altcoin in coinmarket and if you have good knowledge with trading, you can go to into poloniex, bittrex, bitfinex, bitstamp, kraken and many other site to trading bitcoin - usd/euro or bitcoin - altcoin in that site i mention it.