Reading your post, I have understood that you are very eager to join this trading platform so you have already made some plans regarding this issue. Since trading is one of the risky platforms so you have to play very slowly in order to make your sense very clear, not only that but also you need to cope with this platform in this way, I think Bitcoin is the good source for earning money by a short term trading, not only that but also ethereum is another currency which could be the main factor for short-term trading. whatever you do, you need to play the safe side.
In trading, you must know what is trading first to have an idea how it works, trading exchanges to different coins commonly you read this most of the time to the threads as buy and sell. Today there's a lot of trading techniques on the internet as a beginner you can use this to your starter knowledge. I prefer to ask people who already experience trading most of the time because they have reliable information can teach you that you may adapt to your everyday trading. You must know first what is the best coin suits you and gives a lot of profit today bitcoin is profitable even the price goes down because of any reason in the market, it is good to invest in bitcoin because the price is low and go for a long term trading. Still, it takes time to earn a profit than in the short term. If you want to try daily trading or short term trading, it is suitable for altcoins. Altcoins or alternatives like bitcoin but has a lower market value, but still, it is volatile and gives you profit too.