Can you please suggest platforms and coins for daytrading? I need a platform which has a good android app to trade from my smartphone.
Coins : always day trade with top coins which have enough daily trading volume so that you can easily get in and out with profit.
Platform : You can try exchanges like binance and bittrex which have millions of dollar worth of trading volume
Android app is not good for trading use desktops/big screens. Also many trading platform don't offer android app but all of them have mobile version of their user interface for small screens which is as good as mobile app.
Binance have their mobile app on play store
https://play.google.com/store/apps/details?id=com.binance.devHowever, I have never tried them.