Bitcoin Forum

Suggest a platforms to trade crypto coins , support many coins not only bitcoin ..

The best platform I wold suggest is this forum localbitcoins! This forum is not only for bitcoiners but also alt coiners, in fact there is a distinct board her titled "Alternate cryptocurrencies". Hang around and hook up with others interested in altcoins right there.

The well secured cryptocurrency exchange platform is poloniex.
This is the most frequent active exchanger with less fee and reliability.
No chances to be hacked because all major deposits are stored in their cold storage.

Agree! Besides all the features mentioned above by the respected senior member I would like to add one more to it and which I would like other exchanges to follow too is poloniex has a mobile version too of their website.

Bittrex is a competitor with stable and good coins listed on Bittrex, of course Bittrex will be an internative to trade altcoins also their support is incredibly great and so fast compared than other exchanges so it might worth to try.

I prefer Bittrex over Polionex. i don't really trust polionex, when I log in it states wrong password ???

you are already advertising one in your signature, and also getting paid in their wallet. so start there and play around with the tiny payment which they are paying your rank to learn some stuff and then move on to a better place with some real trading.

There are many platforms to trade between different altcoins.
Poloniex is very popular. Others are Cryptopia that offer a large variety of altcoins to trade with.
You are wearing signature of Yobit, but it is not much preferred in terms of solving user issues.