I'm interested in buying to hold for a year or two. I know that the price is high and it's recommended to only buy bitcoin in "the dip". However I strongly feel it will go higher.

Having read through a couple of forums and wikis, I noticed that most of the recommended places to buy bitcoin are no longer online or have shut down. I saw this with bitmarket, tradehill, and (famous?) mtgox websites all no longer sell btc. It seems there is a big turnover of exchanges over the years.

Which sites do initiated users recommend for purchasing bitcoin easily in 2017? I may go on to try trading too, so any advice for this would be great also.