tl:dr - Low marketcap is directly linked to the probability of huge gains, but hopefully that won't always be the case.
While there are a few exceptions, you have to start with a good coin. There many junk or so called shitcoins investors shouldn't touch even at a super "bargain".
Taking your generalized advise may lead so really major loses.
I probably wasn't clear enough. I was insinuating that looking for the next "moon" is the wrong way to go about investing in crypto-currency. If you are looking for short term returns you should invest in shitcoins because they are heavily dependent on hotair and bs. You can make a huge return or you could lose all your money because they were always a scam. My point is you should do research and not look at the cryptocurrency market as a gambling ring. Eventually, hopefully, there will only be a dozen or so coins which all serve a very specific purpose and are great stores of value. If you find one of those coins now the sky is the limit, but I can tell you that picklericks and monkey project coins will not be one of them.