Can someone recommend a site to start trading altcoins? I'm looking for one that is trusted and has a good variety of coins.
I'd recommend you the yobit website, their aupport ia a little bad but they have a ton of alt-coins and adding new one as soon as they are published/announced. There may be some other webaited but I know about this one that has a vast variety of alt-coins.
I looked at their site (Yobit) and it's a little confusing, not very user friendly. If their support is shaky then I might stay away from that one.
If you chose a certain site, their interface is the first one you will look into. You are confused because you are a first timer in that site and you will have a same impression to the other site as well.
Trusted might not be the right term here since all exchanges including those big ones are prone of becoming a fraud someday. I will not recommend anythign but rather I will told you what exchanges Im currently playing in.
Poloniex - Since all coins listed here are those who have an active volumes. They are delisting coins once low volume was established in their given period of time. Their support is responsive too.
Cryptopia - Since some alts I played were not present in Poloniex, I choose this site as an alternative to play with. Also established a good trading volumes since their inception so I give them a try.