just select 3-5 coins that are ranked 1-5 CMC and keep track of price movements
Sounds simple, but it's too bad some of the top ones on that list suck, like XRP and Tether. That's why I don't give much weight to the top coins as defined by CMC ranking. But then again, I'm not a trader so if there are people using some kind of strategy like rebalancing based on those rankings, more power to them. I prefer to buy and hold if I've got the spare funds to do so.
If one person is leading the market this month, that means he is a good trader and I would agree with that, however that doesn't mean that he will continue to make 100% every single week
That's definitely true--traders have hot streaks, but that doesn't necessarily mean their strategy is a sure-fire one that's always going to work. Plus if more people adopt their strategy, the less chance it has to work for everyone who's using it. I've known that for years, and it's why I've never been interested in purchasing trading software or attending trading seminars (I've seen them offered for stock traders).