There are loads of cryptocurrency exchanges right now in the market which makes it hard to choose specially for newbies but ofcourse there are things you need to consider on choosing them..
First is the security, you need to make sure that your funds are secured when its on an exchange.
Second is the service, You trade and use their exchange 24/7 so the service should also be 24/7 incase some problem occurs and the exchange who always have giveaways/events and low fees .
The third one for me is the liquidity, the higher and bigger liquidity is,the better for you.. Since it will give you Better and Fair Prices, Market Stability, Quick Transaction Time and ofcourse a better TA which is important in terms of swing tradings.