1. Where do you trade altcoins/bitcoin and why? Bittrex/Poloniex?
2. Where's the best place to change bitcoin/altcoins into FIAT with the lowest fees?
3. What's your strategy in trading and how much do you invest in it?
Thank you so much for all your answers!
So, I will try to answer your queries in Requested order.
1) I trade altcoins on BITTREX exchange, they are the best. Previously I used POLONIEX, but I had to stop using them from past few months, as they have high negative feedback from customers, specially on payment system and also their volume is less than bittrex. Bittrex is best to use because it has high Trading volume than other exchanges which means they have high liquidity than other's, they are regulated in the USA which shows that they have good security, they also allow the peer to peer loans service and apart from all these they do provide the best customer support, and they are almost active on most of the time.
2) I use UNOCOINS for exchanging with my local currency and their fees are comparatively low than other's approximately around 1%. Its best for me and apart from this I also use ZEBPAY and even they are good to use.
3) My strategy is simple and powerful, and it is TREND FOLLOWING. Ride the trend by following the DOW THEORY and then invest in dips and take profit when you gain 15%to 20% profit on your investment on your each trade. Investment depends on you how much you can afford to lose. Beginners are requested to trade with small capital($100 to $200) at least for three months and if successful, then you can move forward to big capital.
hope it helps.