Generally you need to buy the coins before they start the steep rise.
Look for an accumulation phase. A slightly upward slope with medium volume is usually a good sign that it is gonna blow soon.
Although in the current market, it appears you can just buy any coins and sell it one day later for a big profit.
sure you can earn in one day, for example look at folding coin today, it almost doubled in 3 hours and i saw it when it was already late, there must be a way to see that quicker instead clicking coin on market to check the graph.
reduce to 5 or maximum 8 coins. Tracking more than 5 markets at once will make for bad performance.
i track maybe 10, but there are always others that start going wild, i have a feeling im missing a profit by limiting only to few coins