I guess you need to have a lot of free time and some organizational skills... There's no one special place where you can see everything, coinmarketcap and coingecko can be good for some basic searches, but you need to be active on Binance and some other exchanges that have many new listings and promotions with new coins and tokens! Keeping track of all of them really depends on how you will organize yourself, some spreadsheets, lists... I believe the more new projects you include will be harder and more complicated to follow them all, and expensive to invest in all of them!
I think it's better to be active every day as much as you can and when you stumble upon some good project get more interested... after some time you will have a nice list of projects you are interested in, you will be able to follow them and invest in them! Too much of anything is simply not good!
Yup, just basic things can be found on coingecko and on coinmarketcap but the real deal can be found on the projects dedicated websites. New projects cannot be found instantly on binance or on coinmarketcap and coingecko but they started on the basic sites first because big sites have qualification and are strict.
Tracking every newly released coins are not a joke but it was a tough job because hundreds and thousands of new coins are being released every single day by the coin developers. Tools given above are helpful to list the coin because it is not possible to memorize them down in our head. No need to invest all, that's crazy but he can just compare the coins in his list and grab the worthy one.