I'm fairly comfortable with cryptocurrencies, but have just recently really started investing/trading and have a question. I've set up myself a portfolio that I plan on adding to and changing over time. Right now I have only about $1200 invested, spread out anywhere from $100-$300 between about 7 coins. All my holdings are on trading platforms like Poloniex, Bittrex, and Coinbase. Would you guys suggest keeping my holdings on those sites or moving them to offline wallets? I know its safer to do it that way but since my shares are still fairly small I wasn't sure if it was worth it. Should I download a wallet for each coin or look into something like a Trezor or Ledger to hold them? Or is there an offline wallet that supports multiple currencies that you would recommend. Any suggestions/help is greatly appreciated.