There used to be a time when people made decent profit out of the spreads but it is not hard to notice that arbitrage is less becoming interesting and popular these days. It must have become a lot harder a way to make money. So if you are really "trying to find out genuine ways to earn," I don't think arbitrage is the way to go. You are better off learning basic trading.

If you are looking for long term crypto investments, you are always in good hands with Bitcoin. But you have to realize that we are already currently approaching a new ATH. You may decide to invest right now but you also need to brace yourself for a possible deep retracement sooner. However, you can almost be sure of another round of Bitcoin bull run in the months to come.