Actually just watch the coin that you want to trade, read some news about them, maybe in twitter or telegram.
Be adapted with its price action, and stay alert to bitcoin rally.
Well if one is trading in btc then just need to follow the overall global economy regrading the btc. Rest of the coin like if in ICO or at initial stage you would require to understand the lot of things, need to check their team, whitepaper, how much scalable that coin is or what needs it supports etc.