Newfriend here. I feel like this board could use (another) sticky

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Newfriend here.
I feel like this board could use (another) sticky with a wiki about crypto for newfaggots like me.
Obviously I was able to google terms like hodl, FUD, wave, heavy bags, ICO but when it comes to exchange markets and where to buy coins I feel like a lot of unbiased information is missing. For example I used Mycelium w/ credit card to buy BTC and I got worth 280$ BTC for 300$ and on top of that 30$ fee which seems like a terrible ratio.

So I have a few questions, if you feel like answering I'm thankful otherwise just ignore this thread (not gonna give away any coins).

- Bittrex the "best" exchange market? Currently on Poloniex but a lot of coins I'd like to invest aren't listed. Pros / Cons?
- Where to buy and sell BTC for USD/EUR/credit card to invest for decent prices? ID verification no problem. Kraken?
- Do you guys use hardware/offline wallets or just got all coins on the trade sites stored ready to trade?

Thank in advance